Malicious PDF — malware analysis report

Static analysis result for SHA-256 039f021a588ffbba…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 09:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07657774a558722a6b715fc8f1fd5873 SHA-1: b9dc9bc5977696d9d62cb690c98f133e304db8e4 SHA-256: 039f021a588ffbbaaecf127289228e315938e72a709143420fd48787d08a1a71
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/378f137809002ac6f9579e1843a42f4d/3097106261.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7654313a23---25362133423.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610113d713a22---kelugamumofogagugebax.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/pipepemulujokaku.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/paskc4sitfd4bcc4888qlespkr/totebusi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/kebavafoditavotebinatufon.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/43082726175.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af902b69668---83633845272.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1d34fe204ff0f922fe41b69b2155036b/51626827912.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2f08d1d8ef11c79cd9eb3d3eb7007da1/14843033131.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210718022818422501zma4ljs0nhg5.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/wokaxodigitawawofowafu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1f6aa989---51858774231.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080716232021.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mozumutizudipetarov.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b625a1da---75019114713.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098308c3c870---86311190477.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/44140378896.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/tetevorep.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/nijoforisulajigibajotesa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b92a5d2d6d---wobupedusemesux.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/88e2d77184b509ccf4e11553b737f548/89077008677.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/xusuleratutadudaxeritojil.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/37013329160.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/207371e5303fc6a141ab7a3655df045e/90190098415.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/dexebivodipofasixato.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/felubituz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=genie+manual+lift+rentalPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17456 bytes
SHA-256: 1e491a34b88e9651c4dbf9ee27c08797d8986c18f86fb31f952c877122fa026b
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 10224 bytes
SHA-256: 4a78fb2f71a8094ca6edb59cd3118025c747fb569f7a129169a6cb8808c01abc

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