Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd95a6da246aca1…

MALICIOUS

PDF

83.8 KB Created: 2021-07-21 03:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b10adea42471017a3ee906b49e5055e7 SHA-1: 67e65a6e6e1b6a412e1cb04898925bd7c736c91e SHA-256: 1cd95a6da246aca12016b8af911d0afcd354ea65b282717f217ff8a57207a8be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The presence of numerous PDF link farm indicators and the ML detection strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ikincielinmak.com/upload/ckfinder/files/38205067039.pdf In PDF document text
    • http://asianmosaicnyc.com/userfiles/file/37316817896.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f41befd6d24c0822e16c1ae93d5e394c/3204939479.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df0e0c0ddb4000c250c9a056e2dd3ba9/27747490046.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/fagivewur.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/jetimedelika.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/17636234719.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a733b465b12---42465192191.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6b506512---67985093147.pdfIn PDF document text
    • https://elektrona.cz/files/file/39813735802.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b183fbe4---wojewalimewenodikudoloma.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/32611156115.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/66990764353.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/bidiwa.pdfIn PDF document text
    • http://langmypham.com/luutru/files/83631717468.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/96969924579.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mabovedutaliwim.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099de43388ac---lumifefovemeze.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/firibozonavonagumiso.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/486618583d86b9ef6fef1ffba7b8baa5/zureduzusivulapire.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4c565ca6d---nebivora.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9370c2e765---felusodomokogevapeto.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832c0f68d2c---kanut.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jilakubawefezoxozepisinid.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/64196090391.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/feforosejulab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=answer+to+question+33+on+the+impossible+quizPDF 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://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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 11040 bytes
SHA-256: 019947ee4c4b28d36310536ab549f5ef7a3e5dfb0ff75f8bfd38d1c7e01630b5
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 17376 bytes
SHA-256: 574a41dda7164fa3f150aaadbb44da1f178f7066a3bb6d0f241b10b063897ffc