Malicious PDF — malware analysis report

Static analysis result for SHA-256 b003972eabb042ef…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 04:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa86da4e08a8a5fb07d188510fbb542d SHA-1: e4f510b617143d4168d8c09c364875ea945773da SHA-256: b003972eabb042ef8c5c9f70916e01dfacda46fdff4b36d65ae31fc9bc30e1ab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=spanish+subjunctive+vs+indicative+practice+worksheets PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7bf55c226---15672171274.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0133dcb7bb2da942c106e107e828186a/wotupevakege.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/7433050681.pdfIn PDF document text
    • http://goldmustang.com/files/files/95586898010.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/42285871372.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974c538ec05---36494874730.pdfIn PDF document text
    • http://goldmustang.com/files/files/tiwofaxeberedox.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/zanivoxetumujuruwul.pdfIn PDF document text
    • https://digireg.com/upload/68563111987.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/06gpbo51snl70hs64u05gdmt66/95529518011.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d14292362---42162294191.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a758bae5f946bff1552067cc2c60d1fe/46535664371.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210802201633665.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23778f061---loxoxojotokorokaj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fff7483ca4ddcfb69408a8333a435650/23279294468.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/32317389905.pdfIn PDF document text
    • https://inifd.london/uploads/file/fapozusoses.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c08c9d91913d74997acf7cd668324e9a/tekezawasisarubopopala.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cafbdb5b---34561323658.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rqtu2ijrqn5jf4iddkt35h4454/xijosizu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vejodurago.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2fasiqgj651hls7sk78upm6uhu/1742145471.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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 11252 bytes
SHA-256: e8fec9f69a527de304a87444a25bfb013493c09a985aaecb1a3a4da9937a1e0a
font_02_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 16328 bytes
SHA-256: 97ada776e260ce5cbd8fd77c57789093f09d070b5aa3a3e87952407778ce033d

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