Malicious PDF — malware analysis report

Static analysis result for SHA-256 258fc349aee5e5a5…

MALICIOUS

PDF

99.6 KB Created: 2021-08-31 04:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 842a9b90089f7da2b30609996d021f8e SHA-1: 85bbf94316f937ec2b206d94a4945fe0863b61e4 SHA-256: 258fc349aee5e5a5e3a7c85e0abf3908b99f68a0891d94429ac8eb3eb4f5b713
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it's designed to lead users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier clean score 0.1101

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 https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad004c9b990---62985598691.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/8815487069.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/dugeruzada.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/24801296069.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/is930jg50oc3poriomkkc7l7s3/71569195369.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/96860278779.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef772920fd---86363367820.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bf285097c---89459469379.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/77086094130.pdfIn PDF document text
    • http://npas.ru/pic/file/2968699730.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/310a7784eb1b008b59cb0d76e552c65a/18406453432.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lajemek.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/25945064448.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9c377e8e04d6194fd702263d3462c4d5/60519342715.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0eb3490eab1f173c1477ff3afe6f9962/9059086040.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dirowezetomi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae2943dc---sakarap.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/78539476614.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/71864654656.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acb3e9795---63481230792.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3cc1031302ea7b74c65099f771f9353a/mogunenisazo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d293fe0ed57---85849167647.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qhd7k9k5e5t4lehosr7s4q5kje/36300686323.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f03f31dcd10---14803774663.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/fewolusoviladivew.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/021845492089.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/vutadobovukifotidubog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=carcinoid+syndrome+skinPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B7 10624 bytes
SHA-256: 068c94db1f2e58b6726c81bcb808184070217c016c69fb94fb52293296ae25da