Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0a0d958100bfa2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 15:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecf7d4e1471213ba93c418ac605bf472 SHA-1: c09a382ba68473e6bfb4928991bb523c71789726 SHA-256: ba0a0d958100bfa273055a815d71cd1a27f05bd9907e067a83ccda921f53dfa3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aj-freight.com/ckfinder/userfiles/files/96890234305.pdf
    • https://sssmri.com/ckfinder/userfiles/files/semaveveruduvujujodidureg.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d898b2aa---18131504731.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085099185224---demerokozibe.pdf
    • http://learningkey.org/userfiles/kidadevodulidimunasumi.pdf
    • http://apcmagon.com/userfiles/4391472170.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27abd32f34---wijijozibiviwop.pdf
    • https://makenie.com/upload/files/duximafisulexewidikib.pdf
    • http://contelex.it/userfiles/files/89566221278.pdf
    • http://portaldo.eu/contenuti/upload/file/11717398673.pdf
    • http://divorce-difficile.fr/userfiles/file/jububewimoxowiwilos.pdf
    • http://esistore.lu/userfiles/file/lurolozififani.pdf
    • https://xulynuocphangiathinh.vn/images/pic/file/68105755974.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hp1qq1m809vpasu529ckvcf563/dasopezonerafolinigu.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f53332206881485bc43d78e4bdfecf83/paseborerulazaxowigiwo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcad866339---jizezazugeborudadi.pdf
    • http://jtour.vn/userfiles/file/dujapifukokufoj.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/14513723639.pdf
    • http://agriturismoilnoceto.com/userfiles/files/66211837596.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/87950710434.pdf
    • http://csc-021.com/userfiles/file/20210714143736_pgaefv.pdf
    • https://soechi.net/userfiles/file/zusudegikozeda.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4a82f6437050a5ed1460c615e50ad346/bodukisonukixugagawuxodi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=reflexive+pronoun+worksheet+for+class+6
    • 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_off0000c490.bin
eb9ab9672015c123dc1f2de91aeb02ebddeaa88137f48a8a46647bf72c8c9cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 11236 bytes
font_01_sfnt_off0000def6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16792 bytes
font_02_sfnt_off0000f708.bin
579942bd241e48b59100548bd51d9088539ef56239e3d6e9c6f00ffae5a28f77
pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 17272 bytes