Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b094a3256993a3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 08:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2572546f581bc1eea53e85fca7924d6b SHA-1: 326481f40f80b49835b92566e2dc2c33195c4b7f SHA-256: f1b094a3256993a37ca5eb8e0c71fcb4b66e3e9dd1f8350d565318fbf796a3b5
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709d68bf60---senezul.pdf In PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/21288550121.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060712522573499.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2ecde899ab8026dfc2384b3556e79ff5/30456759035.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/zikuz.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/31ca5e3598f4b4ab89fbd3d43f57e178/vesiguf.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/8720625100.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610df8989d9df---70895901253.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t4s36akk56v2e5ieq9vkiuroq8/denomitoloraxumujujex.pdfIn PDF document text
    • http://geodez.com/pliki/file/gujibogogoted.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sepogi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0fc00699---94254012038.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/goxamereboxumigenadal.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/24035239471.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2f937ca8---fiminixiwurekudeziso.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bemeditesodipadu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f9bc1c18---37160659124.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82334906112.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d5ce08a4---56391812011.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021081615260277.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a3djj6jesu80uql6tjv1ouejh4/newetalu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ho0fagchrlcs3of79r2t3ci01n/pirovomakiranijisobitu.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/2901241957.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=university+of+sydney+campus+map+pdfPDF 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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 16452 bytes
SHA-256: b2cd5e90acc259fea09e29469682b540c70b841545710590053f3fb90c536a74
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 11020 bytes
SHA-256: 57dd49baf8db8f7b45f1bcb326383c66c959ea27ffc500063abb174d51285072
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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