Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f773c6865c05288…

MALICIOUS

PDF

102.1 KB Created: 2021-06-29 02:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0835fa9bc786cdc63306d2badb57934b SHA-1: f0cff477d09266bf0bc69603c7a85e9fde8e7731 SHA-256: 6f773c6865c05288365380f99e45ec64727c74fd4b26cc3ec84835320039c134
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, including a fake CAPTCHA lure and a callback phishing pretext. The document contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the presence of a fake CAPTCHA and callback lure indicates an attempt to deceive the user into performing an action that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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) or Microsoft license-boilerplate 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 https://leosservices.com/userfiles/file/17565618786.pdf In PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/giwobubusoj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nq3vigbc6mh35gbsadr37og5ql/wujidozibe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aef49d048---50874084062.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d9013e47f442d9f8dfd0a6c76a5e1d1/79468000164.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/dedogenetu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18259790052.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nm2d6j8s16cv5sgiut0aa7rflr/sudutovoxezevuk.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f28a90351870bd80e1205572b32f84cd/7046963336.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/bubufebelasituperod.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097223004e14---gowujexame.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/94254298771.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e275a21b6---9182102018.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f33fd0a422b16f9adc8b8a74ce65c416/73608430207.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210621180156.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/nusimudowa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b76775164fc---79515151142.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/90287006866.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/129c3e4197c9b30ef819a4a167fe7271/nutilovudowej.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bukoxopusavigogu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062118563474.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/789e4188d941a824655b6937e468f9d3/7434823151.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/59395397919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=army+dssc+past+questionsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 18304 bytes
SHA-256: 706fb3abef03ca0d0f3ffd60a711a9181c3273a6d9f8d761a5b151fa6b6c4ebc
font_01_sfnt_off000159b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B4 10972 bytes
SHA-256: d811990bdfcf8ae1f35c106a41263f62af920c998453c9f19d9efb2aa1095c02
font_02_sfnt_off00017305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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