Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04ae983d39c07e4…

MALICIOUS

PDF

83.2 KB Created: 2021-07-14 06:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1eaedb12307379edeef3dad0514dfa79 SHA-1: c80337a2f7cf787272e58af64756312bd81eca76 SHA-256: b04ae983d39c07e465453d02a22361635734937869f51cf7783534fecf658dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072191194168---17177258127.pdf In PDF document text
    • http://sharise.net/Uploadfiles/files/55770150065.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c559c7314c4---woketilotoruxex.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/83797171626.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xibigodik.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/jerevuvixefatudufawaduka.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3g1nmfvg62pf32bg031ffhejer/3098124845.pdfIn PDF document text
    • http://sport-way.ru/img/file/60631869052.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/74110067019.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/no50b368uo26386p60q53tnf46/besiwozarox.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/98762317629.pdfIn PDF document text
    • https://yellowstonewildlife.com/6335828499.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/feladavag.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fawofumodididesujo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2fc28685dc4d45ee2123937497cc1d6c/waninanimukitedep.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5e78b1da---28863678008.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281047433917.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jatubexetarod.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/87562001974.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f746313b73---1212364083.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/24499116634.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/rapogelinolaxupidarazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=definition+of+acquisition+in+psychologyPDF 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 16716 bytes
SHA-256: 89af673e5ef6f9dad3bdc11fc3952d675578db2f4ecee5517f3b3702b480caed
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11020 bytes
SHA-256: d7eaf8addaae25633f6d89dbfb11dcd340aca6ee2f0fbaa4e5913976aedb6d50
font_02_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1