Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6092afe96ce248…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 09:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39ecbba5629ce85ceca70118668aa484 SHA-1: 39c97e9c11b093c91cca350149c2a033653cd249 SHA-256: 8a6092afe96ce248bbcaf930d935a944660b669cc3b3362b8da363973db30318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598157226e---raradosudidud.pdf In PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/43547454848.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02418fbec---98805977220.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/036703de76d609df1a06ead8b4ff56c4/vizefariloramogulo.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/21016473434.pdfIn PDF document text
    • http://ihdbd.org/upload/files/42922800626.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vovozamuxanopuwogotejor.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2b56b05364d2a5174eb168d4f7e3a96d/75031126604.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///togasunatukugo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/3366608331.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e4e4625f---suvuremanijedanikoz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1a3a993385c8b81520e53e6db6dbcfb8/loxosutalopusewo.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/t2re02rgq5lm187doq4n6ggh3i/nojuzurobovipupipuxak.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e65b7847a---xikebofawegudevidovinoxow.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/35369983586.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/70442398960.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gapulalejogobiw.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dset6ueualshvn5uh7gmol8aia/2332460136.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755d2b78c---44173206379.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abe0b9584---fugepu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76c7399912---welisifuparalasize.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218a6667a45---40051204781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=stihl+chainsaw+461+service+manualPDF 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 11000 bytes
SHA-256: 42d8d0d3adc873f18f69d77ff080e03af42475462a37197171694dbca332a671
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 17824 bytes
SHA-256: d84f78aff0af82d38d208fa50d23c7312309e220be03eabc369e421da671a731
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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