Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceb50896fd0d501…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 813ab23e7d2e6847d8691614d089eaff SHA-1: 22c9d702da310aa667e546ddc7df4eabe56e6a95 SHA-256: 4ceb50896fd0d501d3841b105e091236386781b64ebdce0a79172ec747e7ef6f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious payloads. The embedded JavaScript and link farm structure are consistent with techniques used to exploit vulnerabilities or trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=to+grin+and+bear+it PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/22007237120.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/40859170351.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/tf7ke3o6ijpa3td3a3tjt9a2rs/57191266690.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0a92efb2d6d7137081e7074c6d504cdb/rofoperilekoba.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607050df15202---39195295704.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021070704073580554.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tabazudo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c41fa1a94784091af4cd116002116903/segibunarapinugujirozu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/6895163150.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/62345566138.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fqpr5btbtfvpcjecsd09ogkhmn/36330397834.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab242ac80---39300177005.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa09046599---93521720049.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc59e5b0e7a---vokaxu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b1aec41800fd4f0e49e6d47d853cc79b/12847598592.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zorupurumuk.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078139775e86---jeniguzumodixiwusukojuli.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/56689476966.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/xekijimijamojikurapaxo.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a015c980be624847a44842cc632ea82a/78157299146.pdfIn PDF document text
    • http://garderoba.sk/images/_file/66912535178.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7ea3336a---gikowigikubija.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/pojivok.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd10f769cd---zugisatorab.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093d86161282---mefuxifin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 10312 bytes
SHA-256: 0ad6b6a105ce12250ed4e7f13f81c1b3f0b7e338563f8887021a709fc5f67413
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 2252 bytes
SHA-256: 0532d7a79792a82027cec84c69b333dcc9edcd7651e178478ca4fb2b31ee65a0
font_03_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 17244 bytes
SHA-256: 07d985556d5e889cd38b5fe578ca5cd1274fbdc9f191a9796cb8eaa22dbdeb9c

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