Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a645a9c32cc301…

MALICIOUS

PDF

75.4 KB Created: 2021-06-25 05:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a958b561892d81e4a951333b8730d227 SHA-1: 0bc4b24a9b14d4d7da6a7c8494ea96bec918253f SHA-256: e4a645a9c32cc301b1940456160bf180c5fe05da28d7f3130a2577721e44da9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the 'urgency lure' heuristic further support this, pointing towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e382f953e5---titipomukanusuwev.pdf In PDF document text
    • https://syteq-pro.com/userfiles/file/35000319477.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b22d0a6b1---40050743640.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/610lc4m363qtttm2o006l93mt3/52568299018.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f67a58584---zoxul.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cb69a007b349b6d41873a746f6e37c61/wobujunabinofiwasemodimu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dilejudilukazisukud.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a2979af9517292fcf13efe2f91aa8b4e/97070268714.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/tugomuxuzonok.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vofb2qmdb1u2fqsi7agbk52au0/ratikabo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/rexamovi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/66984bb060829d8251cda6406acd2b51/41577528616.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bozusefixogotamur.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sifodakekuzo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/71790739c02d601ee1cf68ec9378f2ae/lolunimu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a32daabb8083671e54c6955fc42aaf5/91913497820.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/65605795032.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=affidavit+of+correction+title+alabamaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5176 bytes
SHA-256: 5ba2cb30df5adb44303f6ca2285d0031abe2f0ecd0367a2440e55653170dc009
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 11204 bytes
SHA-256: 5fc1197a807a22be32fe40b67e43280a9cc556fd139b2f46296f320fc9cb2e8a