Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edd489d96254b37…

MALICIOUS

PDF

96.7 KB Created: 2021-07-27 22:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59b28e91a89aafe865b5518456ede418 SHA-1: ecc5bc599df4b6d11c3e3a0daca22f1eedf7fd38 SHA-256: 4edd489d96254b37f9be1ae5e92ff061acf1dead9a7dfd4e5d3a6b263f9456f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983d2a12305---fiseloxuzonuxitobugek.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/gopejozememobogejo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ua4io8km7tdn4sgvh2v637b1i0/xasunoluxedur.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/70137831546.pdfIn PDF document text
    • https://bczenekar.hu/files/file/47945548161.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/83a93010b762b4c4834eca20d65b0d46/pegivosijatexokejafegid.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/bakaratavototagu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/46pfle08rslm5ndnht2s8c6ap6/nurorelenunogogagawi.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/98556804079.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9f8a672f84e4a2aa25c1d35985439fd4/49947517994.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/90892925064.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f269cf1c0e0---sarivepetatedeje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ff62a980---21268912794.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6fb636c290e793d65af78b7db873b90a/5828330024.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf7219b4d---dinunagawijitat.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/g2eibjunfehac92p54eag6a44e/lezej.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eb119981c038b2bd72bf2e464eb397fc/zilizurokoni.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/43716644511.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8f678e1cc11dc85a39e159d4fa81422c/xutivazimur.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/fekosowo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/norodefuz.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fuwimadobazanegoke.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/dukusipevovuladigubuta.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/wedibifizaniwufasuvonoziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=realistic+group+conflict+theory+definitionPDF link annotation
    • 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_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 17052 bytes
SHA-256: 7666ef335fb0bb6c2f535bac6d11781763c45a5ba669b4c6e1ee21ce9df1a796
font_02_sfnt_off000157ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FF 11160 bytes
SHA-256: 794dff8ec8caf1b53915d3d6469c6a82409cf36f3fb6f30afaf35c9ed7a2469d

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