Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c72a7bfc864d293…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5501982e6b11d6f9d43c38789f01ae7f SHA-1: 93b6ec95e525233fd32263e9b967e1ac5619aaae SHA-256: 6c72a7bfc864d2938d662f9d621133e70507ed9317d67401d4734f121fb05bd8
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or directing users to malicious content. The primary function appears to be redirecting users through a network of links, some hosted on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://davidhammerstein.org/userfiles/file/88237394578.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce32983cd0---41046910415.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/murebibugojuxe.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2deeb0a5c---92114998360.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/42364018323.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/forutetubibunalubu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094cce621aac---fusutiruligosatazum.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/02065ddd45b7d37629d208a40aeacd4b/28829776890.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/65629308659.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/ninizoxudusipoweziri.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611404ef8a03e---badopumotaxijufuluga.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df1eb8a17805edc757a1f608c4f8fdde/wenuzisu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c50d8849e---xixupav.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/36825107848.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20423540253.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/12888061886.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/99691197126.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/89352594203.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624213666.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/diwokorowukudukil.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/49581609382.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7e336281bb237244829e03548ec2bc32/gewilalarenabuzaseb.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/usarrqsl0kk2a57o6o8gruqs9q/jomovetopitipisobanor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=andres+caicedo+libros+pdf+gratisPDF link annotation
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 10916 bytes
SHA-256: 994eda240bbd9bb1c36c483b2a800c1a90e89809e02bc96c58f459fdd66f4dd0
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 19780 bytes
SHA-256: a6732bedede84828c5f97cb9be1b75331c8aeb6770e7426c59bb9bcd6cfa1067

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