Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f7251f0dd73429…

MALICIOUS

PDF

91.6 KB Created: 2021-07-22 07:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e36bd383776ccf6f3d4e4b0c2d233dd2 SHA-1: 2c4633865b0bddea87539c39c20e8eb641562f4f SHA-256: 36f7251f0dd734295d4024e1acfe156be1c57b5a957694989c4e87248841622f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wakunudafikogumoruv.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/459da05de75b8301c5982bfdb419b92c/87760219816.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/35262219573.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3aa2a981---59678709543.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1df152a5---36713291307.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c8a7fbdf8c0eec7cbaf192f9815d3b4a/kafogegalovuwe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1c6bifpbq37h324l844qr2dlpk/posuxobivodu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/tetus.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/68814567418.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160727877b452e---72946727751.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac536f5410d---votupozojuvosafevi.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/sazusugejo.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/99851686240.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/cl9589em0p3539o1uqm5908j11/12785149600.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zuvoloke.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160960fc9c8f77---79601461373.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/baraxirexininopek.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nukutuxigivulojodaloleb.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e092f0312dc6638382c416065584d54a/lawezefipewudidesuxes.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/diwix.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/23232739241.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/27229296693.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e21100a15f5ab9129a78458941f4b1c2/44392462150.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gomijobapew.pdfIn PDF document text
    • https://ekransamara.ru/files/dafosamolavutid.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05c5308fe---11852660034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=driven+to+distraction+answer+keyPDF 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_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 17608 bytes
SHA-256: b5e8ec4e6d0a86dd92f86c1f5140cf5156423bd30bbf0d3ca6d1c1bfa3318355
font_02_sfnt_off000146ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AB 10676 bytes
SHA-256: c0b33feafaf266d785994b4398e52fcf1d5821da8d4b3243bdb5aabda130387c

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