Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be3f65e28745973…

MALICIOUS

PDF

81.9 KB Created: 2021-08-23 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3db8e5a17070af9de04c66f0e0c9d7c3 SHA-1: 6e2ca19eaa65f6be45c32a2d8704e6ada4c83975 SHA-256: 2be3f65e287459739cb8bc8aa182f5ffb7162e099179d09761d6522afad6d931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with lures related to software activation. ClamAV and ML classifiers flagged this PDF as malicious, supporting the assessment of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=microsoft+office+professional+plus+2016+activador+cmd
    • http://klefmarken.se/upload/file/31401270266.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e0309db2cc694a22288dc652ea54d4b/3670811874.pdf
    • http://traslochimontalto.it/userfiles/files/nekizedapoxa.pdf
    • http://solartgaleria.hu/images/file/funidikasikesud.pdf
    • http://oumkua.com/userfiles/file/mimovobewakinima.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/51871339279.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161177a9806fa2---zubosisi.pdf
    • http://tafgambiatours.com/userfiles/file/mepafaxatiwadimelevazitop.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/3794238263.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e78e51a96e4eebbfe018647216e8bf66/risanegomevibabufuzux.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6dbee8c61---17447296579.pdf
    • http://ahxxzx.com/userfiles/202104/file/pojepedujimozofoxigivone.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/brstq5rp4mfc9c39ctjll49tbr/20735259935.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4hscu973d14cc4j8025ion1fb3/85364001916.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7c03b443a---32322618354.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a05a54aefdb4b38e0bb75f1c3e1dc7ed/76736372995.pdf
    • http://fixafilm.se/userfiles/file/podoba.pdf
    • https://detmers-kontejner.hr/files/kusapevi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d348.bin
fa37a946dbfd85263ebb8ef498c8ac5f7a52aa298d093855a74f6217b3cbad31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 19608 bytes
font_01_sfnt_off00010676.bin
2d490bdfcc3964e2c07c01c7c7d4cc30f6d3c3304e697c7fbeda55a347ac1dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 11400 bytes
font_02_sfnt_off0001217a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 16792 bytes

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