Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c93e34cb32c444…

MALICIOUS

PDF

89.3 KB Created: 2021-05-15 02:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 946b29ced18a762552224d8c4d2afdd9 SHA-1: 4a5197731bb8690395936e236e4fb4f8a49c2d8a SHA-256: 47c93e34cb32c44474e79985f517a540bbb2cd96f56b65ad85512b1703c5968b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The file's structure suggests it's designed to lure users into clicking links that lead to malicious content or further compromise.

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2gmn8tiv8cq5d1oblcqdr0ml23/94414078649.pdf
    • http://coffee33.ru/archive/file/57537892702.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809a996e930---88105879182.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887ad838a6---46232022351.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8b6304cd---58223170505.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/lh6su778cr3htcecnfvhkmm546/wituropela.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077901a6ee30---kaduxobejewerajunotujoke.pdf
    • https://x-software.cz/data/file/25460462804.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd067dfbb6---58639877734.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d907f577af---77304631559.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/349d834830e75a557f0b7993ae4b204a/jovapagegazababewivelaze.pdf
    • http://akcjonariusz.com/UserFiles/file/petopalofizeseranukupo.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/94auoog4qemj7eetf7ndnekuhr/zupovapawepo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/87d84fc593310f24849c560fb23ab98f/40179388692.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc153791da---biwuserokiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apa+reporting+mann+whitney+u+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011924.bin
6ef1301a57102db986f0bee11f9476a50b640cef32b73b748ea4fbfb52cebafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 5384 bytes
font_01_sfnt_off00012b61.bin
b5aa7d1d0759b224c1ff92ad2d360b5185645b40f304423cfa01e91925da951f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 12724 bytes

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