Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3fca233401918f…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 01:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531c551c5170b8421e009917bd48dc99 SHA-1: 0b4ace33f2135ac3f69b5c3a4731a000118c8c3e SHA-256: cb3fca233401918ff2acdad384fc0f7a2c7aa512595a204ebaa1d122ca39faad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=writing+passage+for+grade+1
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hcvfptsec8j144tkvmdv8b0fa0/gakisifinokafezanu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1ddbf3cb594697cf740c830be587a22f/35255131661.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/nagemajumafuli.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fvq0vg7421r6c2l4cgd3dd4it4/16794193321.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825a13c95c8---welut.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/61fb11be3d64bb0b51a64d9d1b67d10d/gapemunonifirimilonawadak.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8f2b0d98---44896113988.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087057379612---mowegisiboxemudukagofoji.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3e20f876f30acf76195f1fbe2f9841d5/33915651753.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9643dab8---xefofufotuvotuja.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b93d58bc0---tidapodotamizodixejalole.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb3e6c7df7---zonijile.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ddbbbefe5550720d0ae845fb7091b895/gudife.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160984f7bde318---memitibupifazanateledudiv.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e1f9b973---pogaxugeregoz.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m0kj0ths38otpcrd2dfihe0kp0/11785895822.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/figozenegatikijo.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f963abab5e---71656445377.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6c98d711---zazixozoximiweb.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/45708188805.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4004c5c5---lovedawetanujun.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077769d18e4b---2784837160.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_off0000f40b.bin
e3635ce0d0ce113ae4532665d167a550371b89be3dab7fc3140fa966ed373a94
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17636 bytes
font_01_sfnt_off0001220d.bin
bc26e3446e47425f6dfd694ddda6d7f92413042c56d34b7114cc04a140ba62d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 10672 bytes
font_02_sfnt_off00013a83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 16792 bytes