Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b41e73281681ff…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9928200d488b9d4f5aa3d6321cefeff3 SHA-1: 5c491ce97b1c818e479c057c67785afe41b46ab8 SHA-256: f2b41e73281681ffef8a4593b86410f3254071b0088d7060b674748380669ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pdww.ru/ckfinder/userfiles/files/15241456726.pdf
    • https://hurghadalife.net/userfiles/files/19390477489.pdf
    • http://bjdfszwy.com/filespath/files/20210911053751.pdf
    • http://ortopediaszombathely.hu/editor_up/70132283266.pdf
    • http://studiolegaletrotta.eu/userfiles/files/76460221304.pdf
    • http://sicompk.com/survey/userfiles/files/10323800544.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e297e378c---fofezupemenodiputuzeko.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/89357803876.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/29670339309.pdf
    • http://aranykoronakft.hu/userfiles/file/11782572638.pdf
    • http://tsrmmessina.it/userfiles/files/wisuxozivonozotu.pdf
    • http://energy-labels.com/userfiles/file/79419571288.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/683a5229e9d7e66e6ddf54437cde052e/sexizinasetasaxixegelofo.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/kurusejivexolegeto.pdf
    • http://s2ipower.com/survey/userfiles/files/6835285521.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/kipetiminuzanufeme.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f431cfd68ce8498a5fa48c84673c682a/54686784974.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/nevulepudutofikapugozu.pdf
    • http://studiochiodo.eu/userfiles/files/46009461357.pdf
    • http://bhttourist.com/upload/fckimagesfile/xulasuwoduwe.pdf
    • http://karthikeyanjayaram.com/userfiles/file/78190163097.pdf
    • https://htchninc.com/d/files/jiwabasawidukubaleg.pdf
    • http://baovekhucongnghiep.com/upload/files/pefinawixexad.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614605ab4d6de---vumimajetiditi.pdf
    • http://studionegro.net/userfiles/files/jefurevinakivusulurusid.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4sbe2jfts97pto5l9lnhe7gp5d/febajugeguxogijekera.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/linivenopidusetanuva.pdf
    • http://pecsimutargygaleria.hu/files/file/jomusomape.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=car+simulator+2017+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94f.bin
61481ae44b89701ef2b2ddaac2c1c4aa88bb52560de07f0af51ed3cf4486c333
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 18072 bytes
font_01_sfnt_off000118b6.bin
d49d2c2c26c2533e8098dc11e469fe9fd0a8b0bf298f8a77f28c08eeba808949
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10884 bytes
font_02_sfnt_off0001320b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 16792 bytes