Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91fbd3f820a2185…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 19:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee0508ca32b93f5f8f934f566ab2c624 SHA-1: a679f935c248e72d05f76ac93061e9d709ca20ee SHA-256: b91fbd3f820a2185e5d88b7be9f8021c976a550f646fd23c0edcf2a20604f70e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sm22o38gl3lte65qodueovt937/nirosode.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3d9vjf9126aajdb8cgbrvr03ft/75952693247.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca0fe7b50360c7ab408e899404393534/65160830662.pdf
    • http://bjbtrh.com/files/pic/file/luvuvetepodepobusovebise.pdf
    • http://clarksville.net/wysiwygfiles/file/koguxexoror.pdf
    • http://interwork.sk/userfiles/file/12892114467.pdf
    • http://amctop.com/board_data/editor_img/file/202105100111.pdf
    • http://amuseonline.com/absite/userfiles/file/80017692401.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/903c4550187e9417720224c879e1f892/ketamezuwapemixewezimuk.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e003874d6edf9d00a2f754a6034ccff9/memox.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074215a9e7db---mefupubuwe.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0185e2d20---duxumafu.pdf
    • https://castel.ro/userfiles/file/37248429798.pdf
    • http://cuatudongbinhduong.net/uploads/files/87236964012.pdf
    • http://teraval.cz/res/file/bukekefuzegikekewetipok.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f928ab8fd8---ferutimutew.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hqm1l64jc959p1j5v6bbuofed0/14310346305.pdf
    • http://nationalcoopadvisors.com/userfiles/files/digirer.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5775547672---10556403928.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b68b3af6---98989125191.pdf
    • http://asiavent.com/UserFiles/file///24828544097.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qdqa32479ebnh6d9b43q28ob1d/21420419506.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6a27281b8af02cdb15caf72aea35555a/givivuzitoz.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5bbd4a6dd4942c4e2fef1bfcbc1c0cd9/lamojol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=day+trips+in+ct
    • 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_off0000f4d7.bin
3607a93f3b94261bd44090543fa3e509cabe1d6c4ea18cca621017c96b3981bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 17416 bytes
font_01_sfnt_off000121f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
font_02_sfnt_off00013a10.bin
b026cf76e993643c38387a92af857b0d4014a8d4f7fce8d5676df6e52dedb1eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 10184 bytes