Malicious PDF — malware analysis report

Static analysis result for SHA-256 2079999958932949…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 05:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0314e7176bdaab9a724ce461f886a5db SHA-1: 5637da0e9feff65d2c0b77b3a5247050215bbf19 SHA-256: 207999995893294928d4a17b016e6d6483ad53c957ba15ca702e2417bba04ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or conduct phishing attacks. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest it's part of a larger malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/50955e81da82a4a7c46b3604f6b2df38/72534978401.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26b518843---59969250949.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bb9816158808d47fb58f76251afd4f1/vapitemevo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca159bd881---74454498267.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/29415632682.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6d27c88dd1dc12dad667f2f5a4a4576d/livunowodoxipokikivok.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/88038445065.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/23388105079.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/77b20b24d4055b8b3861d4192fdcc14b/tusetejatunupazak.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626092718408520.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4362201f760f71161b34ed03c6c31109/tokegiw.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/gowedatizeni.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021726915127402.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/81958868851.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa82e043646---duvir.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/24095336056.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d69959ce72741c71bce31170cd2862a0/3789624911.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/7fa0efe5ffe55be9491b8721cb3debab/tizefodux.pdfIn PDF document text
    • http://ruresept.ru/files/file/jeguzikenuxukejo.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ijjuetvljn2ikj19klmkeuu1uk/53030702290.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb3120a70---86221785155.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/28307573765.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb3fa8974---rokoloxar.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/bgfv21lk09q9cics10gp1gmsbg/49646127963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stereoisomerism+in+coordination+compoundsPDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 10804 bytes
SHA-256: a965367229c951770e161b681929dff28cf44b6b47a9a0dd4706238395408b71
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 18168 bytes
SHA-256: 0248d6afc7e4b482715acb9176d416cc2aab5795356c755d80f422eb774c0380

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