Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9b945cb3d94d6b…

MALICIOUS

PDF

96.4 KB Created: 2021-08-09 23:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 553ac054f9618940cca335b61ef0f278 SHA-1: 6a07921cbc2a99bea107f1165c3296771fd77742 SHA-256: 1a9b945cb3d94d6b1069ed5979016d063e768595445ef09566313b3db2c2e314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=korean+verb+conjugation+chart PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01a908bd6---29027784300.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e9941da7---90070643360.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gsfmi6acfvc7hi3hrp01d5jd8a/najora.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/77569391794.pdfIn PDF document text
    • http://beiks.info/public/file/47423232470.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/2738567340.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ed10030---rekezowuvopop.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/19894643758.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/21343866697.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/72281532100.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/20489d56b8102d997d63552add9672ca/sonojisuziweximabepigut.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882db61168c---31400742163.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83ji602tbe83k9fh9tbqej7ls4/45187135997.pdfIn PDF document text
    • http://jar-ted.pl/file/wosalefudomaxen.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/56734605776.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd64d1ae2c---68899537436.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/liselonajigitovuguselo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/46020252553.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4f067a6f---88252562675.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/kalonunumonujelekakitu.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/kitej.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c588c9bb---viwogapexunol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 17216 bytes
SHA-256: a8d4c25834403821e4c32e9c8089aa71a379eaf7aaf8543741f24a067f139d3d
font_01_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAF 2216 bytes
SHA-256: fda8696deba3f48314f04870dd9e097038361f7736f98a36064c7da7ddea9577
font_03_sfnt_off0001598c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598C 10720 bytes
SHA-256: fb5b16be6d4ec0ef0e2f1f723b867cccaeafbec445dae96e7996f6eed1c1d9b9

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