Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8665bad6b6811ba…

MALICIOUS

PDF

63.7 KB Created: 2021-09-16 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82082214b41410a0482389fe6f0c9009 SHA-1: 997be41101193ea71d4ee2753e1f02fc48f3b621 SHA-256: f8665bad6b6811baf02f92137101b8cf67e455500f64a39707f24690213c39b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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://huntic.ru/uplcv?utm_term=double+tap+to+unlock+apk PDF link annotation
    • https://idealist.ro/userfiles/file/68710723404.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/92454156564.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/dagiriwozomenuvifupuw.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9c1ae82001259baa8a18dd35b10f69aa/1745885388.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210905135232.pdfIn PDF document text
    • https://krusomying.com/data/file/sowabonozuzupixunod.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7939e619---28145785344.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/19133993042.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/31640446805.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede085ed77---fupod.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/54103514873.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/18317284687.pdfIn PDF document text
    • http://freestyler.cz/img/file/55013784201.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/63813052831.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/juvalezonixolupufenipibad.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97a71e9d8---99231444216.pdfIn PDF document text
    • https://seger.cz/userfiles/file/nunotekubenopafapavemilil.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4c75e7c3384cbdd782508c11aab3167f/41592951789.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/badizakamazu.pdfIn PDF document text
    • http://asid.rw/userfiles/file/lekusirarotolexojenut.pdfIn PDF document text
    • https://actorconseil.com/files/file/towumojikokunanujugib.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/digiruxetuxogasep.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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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