Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd12278f6d5b47e3…

MALICIOUS

PDF

166.4 KB Created: 2021-06-13 03:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4464ba0218fd17b3f0f1fdd57b49f49 SHA-1: 56911da02c5b0a1ee8b8a6d33400b665cf345c53 SHA-256: cd12278f6d5b47e3b66304a25471f6d0f1d8a37f4437de688f910cc503bccec9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pistant.ru/uplcv?utm_term=motley+crue+80s PDF link annotation
    • http://norilskgu.ru/userfiles/file/4760434445.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/35747599624.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/93099826198.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/88890542297.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cab22e97417b11a6d79f46a5510a2373/nalegavovagexipesajokagas.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87813252637ed6076d691f2ee63639ae/levedagokuverixetomisi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/51bc685846b04a58557c36fd9c1901de/63748591366.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432297600b---joxatafudi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776e221cb52---xozalaru.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/vefogikaguwowem.pdfIn PDF document text
    • http://allycatering.com/userfiles/lejobur.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c0f1a70a4b4db9c1ba63796b6c03fbca/torijipexurelufugefabu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b797e4baa13---40446619273.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • 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
stream_004_off00025e69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25E69 14348 bytes
SHA-256: 650e16ddd31628df706f9a8c3cc5fd2b9b3777798d5701cba4db349e7466dd89
font_00_sfnt_off00024d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D2C 5024 bytes
SHA-256: 642c8244b4e128e30c2e425baa45cd11b6b4c1620d5ed5880013eb35ccb1fc8c

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