Malicious PDF — malware analysis report

Static analysis result for SHA-256 f996954cc8f90f66…

MALICIOUS

PDF

94.7 KB Created: 2021-07-03 17:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf7af1f3803a36675bcf4ba8da48f168 SHA-1: 18f23de159dd98497ad8548ddea3042375a2a46a SHA-256: f996954cc8f90f669ad76a34caf3510797aefa07100959d781e4183646217619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/144232835658d9231fd1f3dba23d168f/10639032537.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/26e9cc6503eb513017ff076462c33200/dusamadovomej.pdfIn PDF document text
    • http://iltorg.ru/upload/file/rivuxawobonikefoketerine.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wekerizokebifofiki.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a85ed47d---mexivipipupazibosun.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/df2ettr81d8ql8hvdl3ci03h63/94284591459.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/nijogano.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5be798754e62ed30c804f1a057b67818/sudomuzilawuduvuzuwugosaf.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cc1b31---17646185610.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/92582638082.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/67828411760.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b0a7ee74---kavegovakomesajojoxa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e30596c5---52858130389.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c6a5bb35---xadaxejo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6b4f9dc7f8b715241f580496f36448f/24719450963.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qudbj5e5p4qaajqdp9ei1nlgia/zezide.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0f9hol4116ncm5f1ohtm46qs67/20844572795.pdfIn PDF document text
    • https://fishboat.hr/files/63601352559.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b776bab956c---90600758361.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e628a423d---lonanutemiso.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6d5118fe23a686293312158342d31a76/lexebamowapekapuni.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3c3391f6aedc60ea8e85024ea08cba77/xuxevowom.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d7af8d69440fe73d706c27d5cb74f833/vejanotinowobosinawa.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/77525853919.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2ffefbec979e4c7fdb42c2ae6de7d541/84007432532.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/kifuxelekotigeni.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/ganowilepodojiranugufogin.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f5ebeb96---kuxorapalajominuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hct+low+meansPDF link annotation
    • 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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 10276 bytes
SHA-256: 639143f925dd2113f571571833dbb92dc968065202b1d51b9407a814042b4643
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 17112 bytes
SHA-256: fa9d1cda6a0d93c0554187dc4602eeb695ecfc6e5c1d2c2fe07d3b364a735cce
font_03_sfnt_off00015657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15657 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd