Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6e4205754489a0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 07:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3179db9e612ed8a6a1757d6e130e9683 SHA-1: 326234e5b86ce348c4b867577c92c59b17a9a1df SHA-256: 3e6e4205754489a0f5c3f623dd1fa744432dbdf2485c853d5782657915dad6b9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. This suggests an attempt to manipulate search engine results or distribute further malicious content through a chain of compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d5327ff886c43348031e4a48c9f8782a/83354868791.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4578f135ae809ff8e366a3f32b175af7/fabopujiwatowinuwaxes.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ombf1rkt1eto39i66n8sr748t5/dabesitobajuloselitob.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k29sb7q2ap7q7s9pe6pegr3303/8617828583.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cf0b508---fufefugapirimivosazix.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nafuz.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fozanaresoponizovemud.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/mazegevutoga.pdfIn PDF document text
    • https://immobilgold.com/file/85842729880.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/97421927273.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/12363366297.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8f6d7325bf9f3d5fbe466850a3c045b4/70929225959.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e71dea83d6bd3f57686deaaefbf91ca4/78456554659.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f9f796e25e0b146510c314a15ff71186/10643946861.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073466a2913c---45058164850.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210706085142.pdfIn PDF document text
    • http://esteel.my/userfiles/file/96924384697.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/17522756368.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gn98jjlcpssehh7tkh4ru0df05/48261489041.pdfIn PDF document text
    • http://fittbikese.hu/files/file/28348537125.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lopemefugamabiximopapese.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9eefce1aa25253dde11470d3d2f9c5ee/58580263800.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/kozaxafusuxopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+are+alcohol+shootersPDF 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 17788 bytes
SHA-256: f65c8d115689de32da6154731c52b465de431893a06b46df6f728ff3631501ae
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10476 bytes
SHA-256: d783164ffcd57240e3571d72ec0594bfa952a26eb16265731ed901757244d0fa

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