Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b1333d5ee1ea04…

MALICIOUS

PDF

83.3 KB Created: 2021-10-04 16:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04014a6482a862a83eaa16e31deb2673 SHA-1: 0b1bae1237309887e10f4500873735178774e4a4 SHA-256: f2b1333d5ee1ea047cce52d0a3d77c5b908b6fdb176f0ddc4c200fb9520bdc9d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://revive.fashion/upload/files/78604930692.pdf In PDF document text
    • https://martas.vodrsport.cz/uploads/files/37851147375.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/72935624189.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/29154657959.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ee9a28f2---76139586499.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/86628201372.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/47611646817.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20211004135917.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914091010.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561bc44e258---tivixulo.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/93035932662.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/venukazavizagadukuvuka.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/ranixinasarasizeve.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bobupilexogejamofu.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910060555.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/vimovum.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/kebujotutevevi.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/49397435534.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pco9ivb1qjahknaktfmpan81k8/62718927008.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/ruzugedolidot.pdfIn PDF document text
    • http://indemo.pl/Image/files/tajenebanaratujafufoze.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/nozupo.pdfIn PDF document text
    • http://nscenter.cn/upload/files/60967658008.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/69151926336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fever+absent+letter+for+school+because+of+sickPDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 18640 bytes
SHA-256: 6ba434c9d3d797494b1aa6d6b9821a9a768459e04a597c4ccf9f469032fd0702
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 10808 bytes
SHA-256: 8ca7a64745a83fc2e4e2c3821e86215b92d44a89497ee33dd6cd1ac3dfad9f5a
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1