Malicious PDF — malware analysis report

Static analysis result for SHA-256 1802d37e78233133…

MALICIOUS

PDF

137.7 KB Created: 2021-07-26 06:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a42ef7fba4252c1caec4c34f142b021d SHA-1: 6bc5e2832fa384bfb6b1cd549fd85f6d4944d810 SHA-256: 1802d37e78233133fef999b3f788230f3768bb25d2bb1ed278f2cbf7c784ef1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into making a phone call, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca1c2ff2e---lulomiwu.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0d23e60aba5e6d692e17ee95cbd87b1b/82447100611.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dutigobig.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd962e5ce2---javigigebupikajipe.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/samatanigeruxen.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ae2bcfffa---76161706758.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/50460249704.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b0b6e677a2ccaa7f76a29c0757b74174/67064602791.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/17837924177.pdfIn PDF document text
    • http://renovator.cz/files/file/91464136744.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/23618653441.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1b3813c1b261f09b5ba4a88765e6af46/30493320336.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zusejasuxeb.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fb7e85b91b8f63d3d01724e7d3c72d99/40050733052.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a60db54aa074c3e025655a032732146f/sitatibaxugape.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d92b9d68---39200459045.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/73769453263.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/nusilugukadejudiviruku.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ffa2b55f---tewimidivetul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fe517bfde25f2587ad868227109b53df/vasewakarukafed.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gutekigubitagemozapur.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6227cb83f8---kekidu.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/64078712813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thomas+calculus+13th+solutions+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B526 19972 bytes
SHA-256: e1a777a8125950c5aa54e5458d9195a38485fb37f5a8eda7e09787c197c8fbe5
font_02_sfnt_off0001e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E925 10940 bytes
SHA-256: 1a97e32340f7bcb9a8466b465d46cebc4e52add611efc88ba25612be8065874f
font_03_sfnt_off00020264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20264 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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