Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c44a357a9bf4a32…

MALICIOUS

PDF

68.6 KB Created: 2021-05-27 13:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4ebad636325c080709d01fdb9a069c59 SHA-1: f6f2f6717984121b1e68e8d0724b58c486ad98d5 SHA-256: 0c44a357a9bf4a32376b68343e9a47f1d9c772009274dc664b359c1d7f4833cf
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains a link farm hosted on compromised CMS uploads, designed to redirect users to potentially malicious content. While no scripts were directly extracted, the presence of numerous URLs and the 'link farm' heuristic strongly suggest an attempt to direct users to malicious downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8db43601---vetabovugutowegafelujaso.pdf In PDF document text
    • https://htddienstverlening.nl/userfiles/file/60683127922.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2e44f92247858047ce33444a20a0fc4/22788618403.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608842d6cf935---rokosetalawofekefirujeb.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hhpt3bu0n4780to8c91hf3snv0/90067925463.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/50339366863.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4fc85fc7---jofiwadafojifosebu.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/45546072384.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71524024d---japowavixavadebaju.pdfIn PDF document text
    • https://mfdesign.hu/files/file/5354966368.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/301bp9e9ugifrimkejhih6qcoo/3233114508.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f16d4513e---pawajagazifunu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7606f19a33e6ea2ff9f12a4dda77ebd6/bulokaxifuwapenofurafekod.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/12709c367809c5216a732572348d97d9/tugalibubutefuzok.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2e452422---95364929282.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f252782e---bozemozur.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/PmAiG5ZyT-k/uplcv?utm_term=testout+pc+pro+certification+exam+answersPDF 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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 5236 bytes
SHA-256: 91d84aa95521f994e3f54c5989f17e28158a4403676cdbf6edb688f47ae4765c
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 11816 bytes
SHA-256: 023c8943bd1b7f9244650fc44c2bcf4beeb951541db9f314417ff685c7e34b52