Malicious PDF — malware analysis report

Static analysis result for SHA-256 faea97d5f0471e42…

MALICIOUS

PDF

79.4 KB Created: 2021-08-09 09:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2c821eb343403e755c9ea55d49bf9cd SHA-1: 139e57980cace5c3d073c3101fd40a2f88c8bc89 SHA-256: faea97d5f0471e425bdbd345ebf554ba27e0028633e7cffbe93cb96a94162ecc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e09fbefbb3---84915948619.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/somasem.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/setezuvupipokuzab.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/31acgt2k91hoi4kblm75h6akj3/gulunut.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/17880234122.pdfIn PDF document text
    • http://poorclarescork.ie/images/20855695481.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/10607b7266fffb2ef64ba0dd9f801763/47353863756.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mj46oifncj3ng628b8ne3m1nk8/sikixenunarufusan.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3b466f60---bukavulazugoraxugikujox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d979910cec500c46afd9629f3bd2adc1/88713865200.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tekoromexuzirorem.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/5931653122.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cc6ff6231a2446c6b653c7fab2478c97/zowapirowow.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/37180071890.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/junaxe.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2fba3p2uos7t3e0qpd54pqcctj/34002550724.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160883500c7098---kexesusiwedo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/95067396981.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2kta0rq49lqu0j4dnu8r02e7d3/68844236706.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/rusupevutudizumanasowim.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/busoroxinizalizovo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nerusomi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3bc52b9be54ebccfb40b66a883ef1b38/rifadawotulagajibox.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/39285736620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sudbury+ontario+canada+casas+para+venda+no+algarvePDF 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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16644 bytes
SHA-256: 9c8ffde72f28e5de6a2694d217678169997fda5da3c58542b986b5af16cd1a70
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 11184 bytes
SHA-256: 3c002d3adf1a8ca58ac6f35680bc3397fa1c9ad7702c238a3bb9ef25df80df98