Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c90e5686d891c…

MALICIOUS

PDF

75.4 KB Created: 2021-08-29 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f31e20ca8d18140fc2dc550ed4501278 SHA-1: c4bfbbcf8bcfdff65d8b7815e1baffe9d868b19f SHA-256: 091c90e5686d891cf901c4bf0eb5edabeb57614c8645eda0deacc3c72b325b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The file's structure and heuristic firings suggest it's designed to lure users into clicking links that lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0bd8ba3b1f48a7b8785faef482dc46eb/puvavuzasenuvafojezap.pdf
    • http://peaceinsrilanka.lk/userfiles/file/bixinonofabigezawemobavob.pdf
    • http://hagelkonzept.de/userfiles/file/topetisonipakum.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16113ad4926bff---xejivupakeloli.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6126c2f82e---kaxexevovituwipimeduvig.pdf
    • http://rana-international.com/userfiles/files/fapirotuka.pdf
    • http://bmsorganica.com/userfiles/file/xamugafoxetidobi.pdf
    • http://denprokhorov.ru/images/file/51592538558.pdf
    • https://blindnow.com/userfiles/file/20145871437.pdf
    • http://ehoron21.mn/uploads/files/kitizugu.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161091c7d048a1---27373003630.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210729_195521_188.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b7b78d227de24f552dfef631b9d2e9aa/rarajuweboni.pdf
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/ripimezegifef.pdf
    • http://historia-bfured.hu/userfiles/file/sixex.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6jife5gd9ank7lim2vr76rq204/81574511462.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9cj61jo1hdluj17ldllidcli66/patopejutilijuvukewem.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607adee4db751---poruvux.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/sodavonoxufogapunuluxa.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4ec9a18e---65202353071.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e02b2a1ad21---fapopagidutuguno.pdf
    • http://sys-svinding.dk/userfiles/file/gosatobadixixaz.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077706d8be2d---83718569005.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rs+aggarwal+all+solution
    • 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_off0000c49a.bin
d15f81fcdf80e5a553bed82387661acc55b0f34fe1ed8ecf867d4053958392e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 16780 bytes
font_01_sfnt_off0000f02a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 16792 bytes
font_02_sfnt_off00010841.bin
83ad4b9ee4cf9512e7549f5f6b6b3e2f8d0b54fddf316120093f760169083529
pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10384 bytes