Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d9c938bf4e2dd4…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 09:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a55199adcfe487edc4172a893cb06311 SHA-1: 9e2380ba002af9e1075277eacfd77bb740f655fd SHA-256: 61d9c938bf4e2dd41251a5ff0b76f5b80443f530f465a633c9e32e4ceeaac3c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of external URIs and link farms on compromised CMS uploads strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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
  • 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 https://synerhu.ru/uplcv?utm_term=khandaani+shafakhana+full+movie PDF link annotation
    • http://oticonshop.com/ckfinder/userfiles/files/68187933091.pdfIn PDF document text
    • http://quetthe.com/upload/files/demerupakokegazexulafowi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772577719b---jamavosagigari.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/lajolidojarefexikaguvolav.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/tafugulugufubu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/agk8kdigi6t4vg6m78fnd32slj/midabifazefilofasevipak.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/wurejirulurujirejubop.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/7039780012.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/64760246034.pdfIn PDF document text
    • https://campermagazine.tv/public/file/94155098733.pdfIn PDF document text
    • http://sswjeans.com/files/89659752985.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210907183144.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613536d79502f---bixejezox.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161370e0e9b615---woxusupevupi.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909162248994996.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/daxudiwev.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/10792570928.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/vamogujer.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/6566067776.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/duwup.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/45005392289.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/xerajenolujodumikokukuk.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/musatakevugulikuzedololaz.pdfIn PDF document text
    • https://ambalatender.com/upload/files/rivawafudojotibimuwiteriz.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909014925.pdfIn PDF document text
    • 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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10668 bytes
SHA-256: 9d314135184ddb14612e3784be18edba58cde34919817ca0f09d70b103e0d552
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 17228 bytes
SHA-256: cdfffc7952b1c42a0bc092db4634fddf839593963eea9c0b0049557a34b250e7
font_02_sfnt_off00014c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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