Malicious PDF — malware analysis report

Static analysis result for SHA-256 023e3c7037c6a417…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 16:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6882084e61656b3f12d7fcf960a903b SHA-1: d974c48e38d794e0ab522202f6cf28a1b7b4be90 SHA-256: 023e3c7037c6a41779a5f5a0d2d05a3fb981e8e6031247c3c6f83809ed607c0b
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript stream is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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://philabc.ru/uplcv?utm_term=frp+bypass+3+apk PDF link annotation
    • http://aa-nusd.jp/xekinenavejukajelaru.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/46903871639.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/zeselawigewuxikapajawuna.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/torefu.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kiwono.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/97094969298.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/12398148356.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613848f30cc88---tivoxor.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/monakigamanexiniw.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/23616950806.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/rutokudefigine.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/93563429954.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/74887025407.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4gro3309j0ncnatc4sfs1oav70/90848793208.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/68275420904.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/lesonibomimipefa.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613479b690dfb---41454071667.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/77107680892.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/27867585567.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zalatofuleja.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/73325315639.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/3406798635.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 10148 bytes
SHA-256: bce8b5421f5a99332c28e7d264a7b707a72c2daacdbf2cfb6c21353feb060e64
font_01_sfnt_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 16840 bytes
SHA-256: d828cdfdbb367db21479511929263d5515917700a4ed9a4b59147b0364697f34
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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