Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a29ff6c6ef0df8…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 09:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 373537cd25211693662d06fdd2e9d961 SHA-1: 0088c7ee813028067c644c142c40e9a75134fc14 SHA-256: 83a29ff6c6ef0df8be3ad2d49e18db046b63d5dd2846231e58186c9e35e6872f
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Callback phishing phone lure' heuristic suggests the document is designed to trick users into calling a fraudulent support line. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, potentially leveraging exploits to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ndt-tl.ru/upload/file/geganugunufo.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/49120202323.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8ac5ebe6ef04333a1c1810745ac1b61f/dujipipopuloziref.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a362eb8cb---soxupevaxagodururev.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49666675312.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9c7f5b59ed1c89c2cfa8f4d73c0fc77a/68410933262.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060956215169.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4c28ddb2---50059549171.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d952b8a83---jadidamupox.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59516170c---62887565203.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/91466653611.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/bubagomojulake.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/95183042119.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cbe78081---repiwugasawisumamej.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jurowogiridaxolekositur.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68e500883---xumexumedusikarar.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/5670140511.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/52c22d55bfb8c45334213f1d6aba9d15/xekusilamimatutu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/47888417600.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3f4f161a005b4e954c1034717303019c/tukezeripare.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a787295421---66458801653.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa6d8d1---fifovapiworoxafelotujobul.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/50c738f3456a85a6faa035c65b65ed6e/19317700282.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/godekolukimiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=maternity+leave+letter+template+to+employeePDF 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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10416 bytes
SHA-256: c0fd6d0d9f2d8c04a0afb277c8da88b0d2f58941f512764f12d3b0aabedb7cf7
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 16980 bytes
SHA-256: e586bf654186f529da60a66303d1d6b64e6f6d7f78642765c74e8a623fe8bc7c
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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