Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5acb1f6b67d7d8…

MALICIOUS

PDF

72.1 KB Created: 2021-07-07 15:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 771b6873ff19760329d6056f7ca45b5b SHA-1: ca161c2d4eee51100332d4dd1a1c8c8517370d5b SHA-256: 3f5acb1f6b67d7d87e15beda819922abf30634bcb68821e49e2e01105bbf3572
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to compromised or disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5042

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://valdhans.cz/userfiles/file/lupofidebetedelivogo.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c060efe29---62955451826.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/kudukufidigu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609603ff777eb---69770991847.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/wapajis.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8b7caaaa573f2f99c974cd7919b22512/mozojujowa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c7219f77---77284895414.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ad9ce1a0167f5d0008ea3b84f525f15a/pabumifamupa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8785urltm81tk16cpuu9u1bff2/94851217782.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/7722160395.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168ae7537e---97673391350.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/49197831211.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8d220a29ffdf0f555e895c125d705605/noxexase.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/80875320018.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/givipuluboxademozasuxupur.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7bjp9kobffgojue8dn4o2sd8l1/vejepamapoboseten.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fhghv7obt826tigavp7kuo9504/61999957749.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1064b36aea---gavusivefumegexagokul.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/65263877408.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mulidifowigamukutivarovo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6cf15dc867fe94674f94f05bf129297d/82417144174.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/vanubawogo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/duzalibufadorakuwadap.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/066c59074da3adfe3dd0d462c77705db/59316095451.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3b8d73ecff9f830c0a0a7673a4fb8344/fokapumugoxovetugafisurip.pdfIn PDF document text
    • http://centurionim.com/userfile/batiment/file/83323164566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+export+word+to+pdf+with+hyperlinksPDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1