Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcf7fb04ab800d3…

MALICIOUS

PDF

103.3 KB Created: 2021-07-05 14:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eed2a617ef629a625e758b4d21ffec0 SHA-1: 2dde99723da5d56a13077b36191b3b7517835d16 SHA-256: bfcf7fb04ab800d38e7e485746001263eb82b82c9ad3808a35947684956bd51f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to leverage these to host or distribute malicious files. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were directly extracted, the presence of embedded URLs and the link farm structure indicates a likely intent to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b968dfd68---4654664504.pdf
    • http://vietthanhstone.com/images/news/file/96758869349.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfad283d5d---pagalelufaxerobubafowar.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db2e5a393---zuwaxelulaluxej.pdf
    • https://amatnieks.com/pictures/image/67734861503.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9ad3ecff---fipuri.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4804bcc0e---89857349482.pdf
    • http://goldenpeak.it/userfiles/files/16155516240.pdf
    • https://ikuseikyokai.jp/ckmedia//files/56438486089.pdf
    • http://goodmix-psc.com/userfiles/files/sasowinotasotixipedipofow.pdf
    • http://aire-limpio.com/img/editor/file/pejekex.pdf
    • http://akkoryazilim.com/userfiles/file/69033158495.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/978c91ffa132482afb84abae402f5a6a/1337050217.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/45712257184.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6974ae2207---bejimovutigifuj.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d368cc81---31009156028.pdf
    • http://nakatka.com/files/file/99250949550.pdf
    • https://mides.vn/images/ckeditor/files/fogipokizusuwogobemufuwi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eb0ikv7gvn7gl7e64vf3fdh427/vovonilijofodubavumonu.pdf
    • http://mdc.ir/ckfinder/userfiles/files/19054296728.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539b460e12---tokuvafururi.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe646a4d2c---rogupi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec7574a45766556fd7637a04a107d628/13773983431.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae292e379ed---58478541835.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pukoxagut.pdf
    • http://nct-vn.com/userfiles/file/tirulivesogelopowajofak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=harden+not+your+heart+meaning
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c7a2c3727cc2d9fde2af2b6c576f2ef4/20599943579.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_off00012d37.bin
196ebf5919e2aea07fbbf65fd59c13e583f529294bd436054658eda72446c5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 19548 bytes
font_01_sfnt_off00015dc3.bin
bdede2f7fa4bf3bcef9673e788e072eb95846c3a59fc66709ebee3dd45f2f063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC3 10688 bytes
font_02_sfnt_off000175ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175CA 16792 bytes

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