Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5e25512ac5eb6b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 17:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 518afbef7907714f8196d9dfa00cf60c SHA-1: 9088d8001f7d6d1211580f4becbf67d3f5e78287 SHA-256: 9b5e25512ac5eb6b49edb425c8aa2c2acd851a20544f6023ed19536ee1f33e53
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the analysis relies on the heuristic findings and extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=science+picture+dictionary+pdf PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7o75lb72p99r7179ifouscvhts/38285913980.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8e25cb37---80233860820.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/73064819539.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7798ac9bc---kofode.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d63d22e41dd---91383780018.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add320228e9---nedasepomatojezizezarun.pdfIn PDF document text
    • http://cartopack.com/Images/file/24723605023.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7291e3931---65765234134.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/63922490721.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/nugumabuxavonekilo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2562878e0b603692d9fb6bb043224a6f/86303615965.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210613000005952.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/3016454236.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f56cac1b---80493908596.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/mirupanagupaxoxak.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/55834316062.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ff3a3c73---gudisegel.pdfIn PDF document text
    • http://one9five.com/userfiles/files/73052046992.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e5f07372---50949569148.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ba674f178ca177e1acf593ba4ce7f07c/dudajazurejisoki.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f9a01b74ac6a8ae8f92ee10b40f64d83/62753137834.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tejopusipakol.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/bunatokomela.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a2253ld0eu5lmgegblupejkdrj/66377403550.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/wapip.pdfIn PDF document text
    • 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 17520 bytes
SHA-256: 312c2a25bf717336b9374e10f45a9a1207304136b4e3f9146fdfed27ac1f184d
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 10688 bytes
SHA-256: c1a40e285c7d0a9d9124cb06818094d397cc789119898a535a3812d36919ad4a
font_02_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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