Malicious PDF — malware analysis report

Static analysis result for SHA-256 606a8bb71a75f6ec…

MALICIOUS

PDF

74.1 KB Created: 2021-08-02 20:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14d0c683fb49842fd3c77dc8f3b48cb2 SHA-1: 6b4125c665e5f066e318864424a62909bb404426 SHA-256: 606a8bb71a75f6ec392578823844610baa519eed6a50e3c14b66eb0d6c0f563b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed as a link farm on potentially untrustworthy hosting. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=what+kind+of+battery+does+the+bose+remote+take PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/e3ppchfjmhrgdugs39rpurmueq/40554798732.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/70025329042.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e409e0a0951---44579611789.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f8c015de09c489da2146fa86861e906b/14087653805.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/43752205931.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/78446356610.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33aba0705d1d6f374c98f267cfc2cb8a/bopesapugiremekul.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffaf23c54---19021342580.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zozuba.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/52895381977.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee4da86f8---xowodudisik.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/tenixawa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/61056195325.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7d645dae---rukiradixodegagupusew.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gebifipabefajavejixed.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/fowamipaxilobufezawezi.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/71641335115.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mejonazurilekedoto.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/38193291785.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee85436b03---36690101379.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0b84964---12934544529.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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10912 bytes
SHA-256: 1b8d8d2266270257d64f00e334e553294b18d0fcf3c0c2af4bbaab2538d6aeec
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16340 bytes
SHA-256: c923618f3b49029665ec44ee54021f30b5780b28d44a5403e80045f352bfd2bd

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