Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94366c8519b09f6…

MALICIOUS

PDF

177.4 KB Created: 2021-07-01 00:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da2005b164918d72f335036b260c2e1c SHA-1: bfe4a74152cdcee8d559a32331c4503cbd04ec6e SHA-256: b94366c8519b09f66e92629f2d1ee4e85f9f027e63a764c62ffbe0c64d71572f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised CMS upload directories suggests an attempt to lure users to malicious content hosted on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/803409f5c69dd01942d719151ed7a847/mexidemum.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e47679ff---detizo.pdf
    • https://asiarsolutions.com/userfiles/file/141253921.pdf
    • http://studio-castiglioni.com/userfiles/files/45044158752.pdf
    • https://estoniapools.com/contents//files/nokavi.pdf
    • http://bainihu.com/upfiles/editor/files/91287476367.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bazujom.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd83d6ce51---7257943314.pdf
    • http://smeclassof1987reunion.com/clients/37165/File/18828892087.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cb992c6abeacab9021c73f4d41afa1b7/migonaxizolowufubite.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdf
    • http://maasmartcity.com/userfiles/file/logelukutal.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd880bc2b---japedexeg.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5991b34881---53049358255.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/epu0b3a7ig3eoocn0ctfdre86l/dapudufigaladubepukimev.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/86205055d901a341250c105f018234e8/tupasuwuw.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/21337caecd8270cf18a70608bd8e74b9/kokoji.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a5e8915b---vadixonokajegiwagawewode.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nfkkm6ci22jaceqedan74ftihv/92663442555.pdf
    • http://naturallabs.fr/userfiles/file/53227367644.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c62299a7---miwalonefematiwepududogo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=comedic+female+monologues
    • 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_off000257fe.bin
02137d383b906b0526f8c482ce7b806956f3b4b6affc2640fa4fb5451ab67ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x257FE 17748 bytes
font_01_sfnt_off000285e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x285E0 16792 bytes
font_02_sfnt_off00029df7.bin
eb7386e7b32d9f9daf22ff44414379a81f65cae9694919c70f33276b9d7c28d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x29DF7 10752 bytes