Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aea1d7ea7591c3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 08:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b74839bf4743c900ac6d7c768ceef441 SHA-1: 30fc79faae4ef2bc62385eb9a63c9e339e3c2bc4 SHA-256: 13aea1d7ea7591c30e08973542826eaeaa9ce4f39e1b7197be62f4a16594f6c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6577

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=pubg+livik+map+apk PDF link annotation
    • https://aneri12.cz/res/file/54860646510.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/51870572477.pdfIn PDF document text
    • https://frisch.ro/files/file/jajixame.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142e41426a87---fekugufubofefijibitur.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/noselenobiluzimegu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf44ef09---sugebijoreragalu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/08c86a90cd59c8f9f546ce7d7fb9926c/vapemazuregogipuzezazem.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/99385693167.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/lemevowibewodoxufifera.pdfIn PDF document text
    • http://brlairport.com/images/file/83284051635.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/64080478167.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/jodosafetukapagafajuk.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/49885521153.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73935f16a---40023313622.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/99756824306.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/91377250969.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/44461284725.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/55358857100.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/14463991207.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/dumimogugidunuwopapo.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/98890781271.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/funeserisirufebatekamixo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kazulakijovesatiludizatu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10272 bytes
SHA-256: 143a98406a96aba8c5a6d7e30816f0a1fed8ca9653c8334d2f7a14e4f975dedc

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