Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a96945d5721855…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 04:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fab7b9a76b0599ee81923c58a3085270 SHA-1: 0e07cd4e645b0298f81ad177524cfa5c851d828b SHA-256: 07a96945d5721855f8d634e7fcdd2a69f16b45e06e3eb3936553f154afaaccfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drumlockingclamp.com/FCK_Editor_Images/files/wuwapiw.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138cdf95f360---xanax.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/vunuf.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/xelobaxive.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/wugivuwox.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/96694412380.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/47370823659.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/rokebulub.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/25788232388.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/38436869664.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/77697914493.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9fa07deb---55146094155.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tosujemimo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/85001106651.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/rusenipomu.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/63962858311.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/togavu.pdfIn PDF document text
    • https://dm288.com/slicice/file/77486534262.pdfIn PDF document text
    • http://vyrukrc.lt/userfiles/file/rozoneroku.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosinekalawopoguro.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/julokutewo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xoruwasufenozelozarozole.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/39851506736.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96dd41257---95413252154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mobile+legends+bang+bang+professional+leaguePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 10808 bytes
SHA-256: 4f1df48bc6687b2f5b7c89b1f54ccb8e2cd7b489d4440f4d71646826356d247a
font_01_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 17332 bytes
SHA-256: d22375098b128be6e89baaefb5f25c254130892fad1e35f25081392e7953613b
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1