Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef8c211d6fd1787…

MALICIOUS

PDF

77.5 KB Created: 2021-10-06 22:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fad0efaf41e7d4e65aa6943a9931d328 SHA-1: e3aa37b2c2cbf77597e056a06028d58fcfa09464 SHA-256: 6ef8c211d6fd1787165654de3eca045f8ff8482459bf105cc1a637cb69992b63
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various websites, including those hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution scheme. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5432

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=signs+of+abruption PDF link annotation
    • http://rintoyo.com/userfiles/file/labetokuxizanibimut.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e4ac8ed5f83ef556aee9e3c5e8a306b/64896943287.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/redefemizudakoseluxoxukig.pdfIn PDF document text
    • http://evola.it/userfiles/files/19902409880.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/42443653184.pdfIn PDF document text
    • http://stw-nowogard.pl/download/file/15469577262.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/vegamu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/nidowawakubexawomed.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140812cb7---76705042543.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021100422180267.pdfIn PDF document text
    • http://rilta.net/userfiles/files/66089275452.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/fizuxilubenunuwe.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/belejelevuxijosemuki.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/93173398738.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/5011957876.pdfIn PDF document text
    • http://jfe.hk/userfiles/35776543069.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/17890226946.pdfIn PDF document text
    • http://pjteam.hu/uploads/ragesitofisogenudilofo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bekobobe.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/fogokegumejaluvibaf.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/valugumokigepalon.pdfIn PDF document text
    • http://kvrhousing.com/uploads/75212904571.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/9304942900.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b7f3c6690---16249868782.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/24248585039.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 19276 bytes
SHA-256: 70a91edbe3255318df3d6c2660da828ca084057937f084e39d8059af548fa29a

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