Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b956e0de4a40985…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 01:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbf8a00872aa43e3499f1108832529a9 SHA-1: 6a061b133ae00b957dc737904dc7bcf36dc96a3e SHA-256: 3b956e0de4a409851398dc71547041d08db70d3593e43ad6e73eb2bb97cc4a5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The PDF contains numerous external URIs, suggesting it's designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=slam+book+questions+and+answers+for+friends PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078496ddca2c---53525446984.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/88029943085.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tr7p95bv88jv78uag9d0cdveo5/99592841649.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c13f6742670e5cdebb057996f571332/fosugu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/44520532415.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3903b2ac7---lakutumurodomilejo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806192a4bac---zopiw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bacfab074---sojopagasakizevuzunaxaj.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520115400896042injdyn.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608668c4d5188---68164777109.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vibagaremamazesomunop.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/jaxabolenalifurire.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6988c842ae7e8c00c9f5270f80fa7513/gifigudezixiwigelikudu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/sm012o91b58n7uohtqcefq6an3/26748086026.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/64831114044.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2caf0992ec774e9d6cc24d38d198119c/41681299870.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/balimewunifaworugevara.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/vakatisufirumesivumivarid.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnb3ibkr9e7s68sk4lhm459n0i/vatukilosijorilofa.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/durekowijamumifo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/19355738691.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4175c66ca---rativusowapowezovere.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/84010657632.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://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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 17460 bytes
SHA-256: b145708eb59aa6a6863ddb80077730641d250bd30be48fcc91428bc0dfd8ae30
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 11156 bytes
SHA-256: 4557d3ab99bb5f358f34f6f2f630ae33be8ef4be7b40621db26b4f7ccf1b3e0e
font_02_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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