Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f08a6ed5acddffc…

MALICIOUS

PDF

61.6 KB Created: 2021-09-06 13:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38213b7570bbcdb171f0ae3571b5725f SHA-1: a58d9501305cf228d3db93a21813a5b00d00b558 SHA-256: 9f08a6ed5acddffc7095753393769de5a5020597a0d59c3f80f34009e658e5b5
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a high number of external links. Several heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9393

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acff239920---pejajoto.pdf In PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/21935705743.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/68185472544.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/lulazigakagagi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98486833729.pdfIn PDF document text
    • http://c-amc.com/upload/files/vojusogul.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/74683519401.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/sosigexamejexewupotumag.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/45740956869.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/ravubaj.pdfIn PDF document text
    • http://i-physiology.ru/upload/xekonexadufa.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/65172694798.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/57641773546.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/87723581421.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f91dd02c---dolipinapaweziv.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jtudku5718oule6k7jjflfh871/73525495431.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/55999028179.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gosufe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e0e41a67---napiredozolu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/83d49b24b0285dec733c5afe5f15993d/vokitujowitomifut.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/57609793546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+convert+pdf+to+excel+using+adobe+acrobat+proPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/fegudulipemolenopun.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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