Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdffbf3818a852e5…

MALICIOUS

PDF

64.0 KB Created: 2021-09-02 04:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6846661716c2cbde0a51c55c7d8d77a SHA-1: 5c0c0e0cdda933871d305e1614d6a9be47687c96 SHA-256: cdffbf3818a852e5bb1161d2486e59e0c32f95cab0fa235042564de0e75f27ce
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

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 http://acsalma.hu/userfiles/files/13405723452.pdf In PDF document text
    • https://implant-drill.com/userfiles/file/jolumasitokupal.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/34535133486.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/sakomib.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/vetesopova.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/ribetaba.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/56543413978.pdfIn PDF document text
    • http://altinay-law.com/images/file/33594401984.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/riteruvudenibel.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/pivizirubomisesi.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/bilog.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nusobazunoveke.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/efda0417df659f2441409ed3e5065169/govawawizuzajavalupo.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/jufewer.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703117e885e---80835022087.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/89946113302.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/13787925234.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0af405a6574dac3173a1aa989b2e5b53/74111834157.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a39bcca80---41438850796.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae8e88fa9---letixewazo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/mulokesifovu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788b9f3932---74615149217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sales+person+requiredPDF link annotation
    • 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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 10608 bytes
SHA-256: 3becb4c3876c357487d1795df40a265b92a5b5159be2b8ffb842634064546b39

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