Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b27fd768cc08705…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 22:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ece7ab3a99e4f1ac3ce97978c37a339 SHA-1: ffc59d14f63e14bcf61b01f50d46a6009aadbd08 SHA-256: 8b27fd768cc08705e5eb4182d33020effeab4411159b2e8f75c52cfa7c993c29
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The URLs extracted point to compromised WordPress sites, suggesting a tactic to host or distribute malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085037980dd2---gatede.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/xobafitewej.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160701906789c8---75916985131.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2ac9e65---kajatirokur.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cc81f332---74369180772.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210619_04a03.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc950064a---6189331415.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mlp24jnnhqkvms1mplvatvr0i7/68210939960.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ed63d20e9eac1d780d58711651f0de8b/kimevadofemixolonojofow.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/wevibuwuju.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f1713e7e4a4865d113c519825339f89a/56057598815.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cda31d8d07c---96143538562.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/nezorigajigugagadejex.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/90993714291.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fojaganinokaxejafus.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/16078620710.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4b8fagh7qgfgri0n8qjt9nc18b/kolamutasuremo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052108175473499.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d1da335aff1ff945752f1631b826ecd2/bozizepikokes.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/8646393512.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/8dq68rt2p4710vmeghneu3m99m/dijaz.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/14499358476.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/rc41rhmv5n0acdvtsfpuu40mm6/lupirozuxoveruwupugog.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6ba21b571634f9a3a3fa7fb00b9fc440/78693217586.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160780d66250cb---fikulalibirunif.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d2e6ed7cd3ccc89a4d1e12ea11d1a06c/87208818442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cytochrome+p450+active+sitePDF 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 18092 bytes
SHA-256: d32f5f0712d4a71b81f62b85e28d5240e237719c46f353ac6996abafc4291a6b
font_01_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FB 11032 bytes
SHA-256: 6ca3f5cc1574bf3bdb226c3f4ae8c1007cd8871959d43a8b2bb13abc520cf04f

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