Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d0d03562af743…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 13:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c904fb8d1151d0fbcce77a0385136245 SHA-1: 2541aa910dbf3268acf6b30d0b14e22df2bbed71 SHA-256: 337d0d03562af7436e3319eabc6c3bae7044af3579a921eda973b2014bee4085
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or fraudulent billing schemes. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting suggests an attempt to redirect users to malicious sites or download further payloads. The ML classifier output of 0.997556 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=learn+chess+with+dr+wolf PDF link annotation
    • https://biocenfis.es/uploads/assets/file/kujadozopolozajabox.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/nowiderikatexubolili.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/10894298490.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/12406172239.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f32d2c637afdf5641fc0bd7a0efe8692/66214771554.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10c9c3145---povekajonuwodamu.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/93756794793.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48828705043.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/dimeginave.pdfIn PDF document text
    • http://traviet36.com/upload/files/rarenid.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161349dfc625b4---16096184938.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/durikoworamex.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba3611d6b---xonigo.pdfIn PDF document text
    • http://balone.net/_upload/file///88778738024.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14966623196.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lulabi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3b14e21ab2b2c583639ad514c076687/1804554355.pdfIn PDF document text
    • http://elitk.ru/_files/14240895185.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/pademafefinefin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bfb0a01792d20d39dcd5fbc0e33ce53b/vosebizewele.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/69370705799.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/19544827495.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/80203696621.pdfIn PDF document text
    • 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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 10616 bytes
SHA-256: e809315476f4fd0c00dd5d6c1ff6f811e361582c8ee88bd0f18e497d91ba5938
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 18084 bytes
SHA-256: b5d7b7e6ba555059c49935ea9551fdcccfae215482a8dba89606e8ef5b53b66d

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