Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ec374c8f17338e…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 04:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10115f4f02c9e4d201f8b29296c8bce7 SHA-1: b4f35298f0727e0a90e7a32fe2fc9cb0efd81bdb SHA-256: 22ec374c8f17338efe7d63c3aab0858155cac5bb6dce9975ae9cf5deb895411a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://arch-teh.com/pic/userfile/59856098597.pdf In PDF document text
    • https://scalper.ir/data/files/file/37099375822.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896804a1c---vuxudivizevevumoxubib.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ae1493fe2db062bfa86bc4f47c71220d/pulim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efdcf76a51---3844382858.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hn2csesq4b9afnprb389bj3gu4/dojekiwakuka.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sowupavolapumife.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/89084118164.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rotik.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gamejowafu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/rirukupefobanodojixolij.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210619072044.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00d002e9---38768312787.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/88ffb2f9b0ac43d0c95c5bd9aedfe00a/33089900311.pdfIn PDF document text
    • http://poorclarescork.ie/images/xaxixolarogizuril.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6878406672---10405257264.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/45898950088.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e843ae34---65944875643.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843228a16a---14286861862.pdfIn PDF document text
    • http://apvn.info/userfiles/file/71627885344.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f962fce3a2---2190847689.pdfIn PDF document text
    • http://adveotec.com/img/file/gusugatuv.pdfIn PDF document text
    • http://slsnn.ru/content/files/70942231849.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/he68dd79spsolfedhlsl54e0i3/74107527190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=decision+making+assignment+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7915b0e4cf96a622136694c0eca74a7b/39841602054.pdfIn 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://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_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16840 bytes
SHA-256: 7f6f01c55e39885537639256aa4c7e270eb51f411808763f7c13d843e604723f
font_02_sfnt_off000140bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 10908 bytes
SHA-256: 8cce0a831331a7931fd512925705f39a07fed6451733004c18d50160dfa4c278

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