Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e63a6c78bec0f4b…

MALICIOUS

PDF

82.3 KB Created: 2021-07-06 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dd57e33c322f4f1acc9960ab758e542 SHA-1: 16d690219c74ef897e13ac723e0ca3360b304562 SHA-256: 7e63a6c78bec0f4b64d19d41a450ffb12976ce9199f42d94290d0e2590127324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs pointing to various domains, many of which are identified as compromised CMS upload storage or hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this document functions as a link farm. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=childwall+sixth+form PDF link annotation
    • http://imailbox.nl/images/uploadedimages/file/ruxojolakigalusalopamil.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/86993678763.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/76553380937.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac775f21980---gebobuxekadejulobid.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/gibugukoxexe.pdfIn PDF document text
    • https://hgb.se/filer/file/98831609114.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/o2amhh4bdo0mml95gfbi6avh65/podufi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608334e064824---32010497740.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/93278977618.pdfIn PDF document text
    • https://alutat.com/data/file/ditaruvefuxarafavifuv.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/97364548083.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d51a1471765---zawanugirimavazodigovuna.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/wuvogademosagezaratev.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/41189858296.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa3d3c5be---rerunipiwirilaselelibum.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/6214897211.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/44dc11b3186d41e4e6b0d62d6e09020e/sijamowo.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/87710147405.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93518d020---benowase.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3a69ccd---99627858601.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d5e314aa6d292d01cd9eef78fa24f1bb/bovuzasow.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5abda0aca6ed796b20bf7e0d90f6a763/kawizuzawaminudosikinis.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 17936 bytes
SHA-256: 969260f429bd401bf8348be20e29d90a5fa043f091ac9137c89e1ec82ed7e155
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10604 bytes
SHA-256: ab411dbe729c8bd9d5913aad65676fec0916ac5a41354f754ee8f90a2fc5e8bb

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