Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb779030df04eebe…

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 22:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2ce35ccbd1b639fcb17c186fe6c41c05 SHA-1: 944b6dc393028dc237fe6736d090de9ce3922bf3 SHA-256: bb779030df04eebe1337cd81629b4ec0ff4d6294c3493e8e309a2f713fff3107
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'cmd' in the document text, alongside embedded URLs, indicates an attempt to execute commands or download further payloads. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://queure.ru/uplcv?utm_term=videopad+video+editor+keygen PDF link annotation
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/177fd55f4d2d2d5afc4fd8843351866e/putubarewogonomow.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e2d5b4c01---polow.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k0lrk2paqentrunrknguheloc3/lelifojivometowitan.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1ts3pba5u4jm0bhg0pb7kruku5/79492905394.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9gb75rn1clo64j46c3402sacmd/kovuxetokinakapurifalopij.pdfIn PDF document text
    • http://digifast.cz/userfiles/48037116830.pdfIn PDF document text
    • http://darec.sk/files/files/gaxelepovaborosesaz.pdfIn macro / runtime command snippet
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acd8b8eb---daxavogajetij.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/82206877637.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nefozorosifo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a090600fcc3---donosikugubamuvemarole.pdfIn PDF document text
    • http://slsnn.ru/content/files/tarudela.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0df1289bacbcf6758408962713718820/19570471336.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1c796f5ffd6e3e0e39ceccd9c6ad1ec1/fosowopewokavirenozim.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2956887ba0---41493944748.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c2c333192065f4aa3c9e5d7befd40de/16564978492.pdfIn PDF document text
    • http://digifast.cz/userfilIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5108 bytes
SHA-256: 617b24222c461241d5e16c01c93b8c8148bcb78bbfdb83abf460e0ca4fb13d9a
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10312 bytes
SHA-256: a693fbdb4f5edf239d97147ecb93463364f429d144d5bf98a3a250b4664b74ae

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