Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b1d3bb25095d15…

MALICIOUS

PDF

142.2 KB Created: 2021-06-28 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26603e7eec50219ccf776ea2e088e838 SHA-1: 85f15f2f01e83287109867052e151a634c9c8357 SHA-256: e8b1d3bb25095d158ef0a3cf7a57b3c9653f895ccb6e3e57cb3035dee3d8bce5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, many of which appear to be hosted on compromised WordPress sites or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a deliberate effort to obscure the true destination or leverage compromised infrastructure for distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the potential for JavaScript execution or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://archism.ru/uplcv?utm_term=all+black+ops+1+zombies+maps
    • http://mazdooradda.com/userfiles/file/73030954797.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6d762004---61278690078.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4822bca391---moxosexabepigub.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pk9gq62et3vsnp71vseq27qrrb/92690402880.pdf
    • http://allnatureint.com/userfiles/file/josameb.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e58220d7a---81969400383.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/no0r3g3ae9k4ei04vbb84o92c0/bemis.pdf
    • https://alexandrapanayotou.com/web/images/static/file/julijodidefumiwupuz.pdf
    • https://presentkompaniet.com/img/content/file/53828659319.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/58487938520.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2a858085a0b41ba4c1e8b60c8882106e/39529255837.pdf
    • http://domainecomps.com/documents/files/gufugimogabifekupuvapas.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607312fc19c0c---vuxefadowazikajatumaxipul.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/57b96cf7043ff7acccd62382ee01edd5/gonivor.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafaee005b---40029685439.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0f8vjfotqcd8cop77ishtqc0pm/44547797678.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085641ec9b3a---79093166863.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607468d3c4735---95018299861.pdf
    • http://app8itebarandgrill.com/admin/images/file/jozuruwedajizewopomirep.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91fc6f55---fofominebenugalar.pdf
    • http://eatatrudy.com/uploads/files/10334536972.pdf
    • http://iworking.vn/uploads/files/39938949995.pdf
    • http://zetrade.cz/userfiles/file/37336837380.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b623.bin
23324b8da8c1ef03429fc9bc9680a435032892c4e2e34b0e0565b9f30eb51c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B623 10560 bytes
font_01_sfnt_off0001ce1a.bin
9d686019f352bf4a133698bf5af327ede218bf8837aac4c2352c5bdc03bebe59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE1A 4808 bytes
font_02_sfnt_off0001e058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E058 16792 bytes
font_03_sfnt_off0001f86a.bin
2790982df8f196a7edf2e1d2a1dedd23a141bf538e8cf3a2eaf742e924d8772e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F86A 19248 bytes

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