Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb3d2bb8c27b13a…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35f8f3f05e690601ed9e31d584518745 SHA-1: 2fd44c5bf57c2ae3e1c16c9a685ec101e97bbfb8 SHA-256: 0cb3d2bb8c27b13a98ce262847ce92bc642f046361a5ee71211648d3179df1a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URI heuristics and the compromised CMS upload link farm heuristic indicate a pattern of distributing malicious content or phishing lures through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=set+for+life+draw+1812 PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b8d3dbeb783db113436e34a645904a9/fudavutes.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be159c1b9b---30752461051.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36971215aa81b7806fea742faa8885e7/fifepawotige.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4672a8fa6aafb0b53d50143c1d424bc6/josuwonulogorat.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/30111560084.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/18719209809.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/95d3bc2811939bd0920ded8d23fab428/34966253241.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/retatazuvu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/ravimokaniva.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/votedotobaburezexuziz.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/82453211838.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857bc204c8e---fewivatolinopuzowoguberiv.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/87935457845.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7c37b574f7266f0be83c6e49f875964e/gezifudikuwajebumemivuvip.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/kutekuga.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/84464121681.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8ed6ca17d079f2edbd7fd1a079ec17aa/33549725070.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6fdbd71---pukobo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3303377a61ccf05c14bf489bef7070b3/gomujeveburodexigop.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080742115f5f---mudonirumasa.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/46600254464.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/jojivepiwi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79223676560.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/21909629740.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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10616 bytes
SHA-256: 84bf21441d9dee818dc19ba1eebff22eba1f93db26f2d27e1d87461651d2483d
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 18452 bytes
SHA-256: 2590ddfceee3c49e326e8c31b6ae293cacd4473a0e8e4fd9ee17b2cf0ef2a8f6
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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