Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7371d9fe27188f…

MALICIOUS

PDF

102.3 KB Created: 2021-07-04 04:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1479a213669b1f8aca06622fab1e17e1 SHA-1: 4aeae9a0c5f5644cdc4052d7a39952d868fc56fd SHA-256: 1c7371d9fe27188f7b13a9b0edb40fe0f9d7908db40662f45b23e004e2b7a732
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these compromised hosts. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f52d4eed---75318940083.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/18b5c161c39f63bd3286c56d9b0a651e/xofox.pdf
    • http://alpha-cp.com/userfiles/file/gukubexakiresebejulofew.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88c223cfc---11381340122.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/59d6018f4f692905ba32ac2c2a3acb5a/rabilobetoxizevuk.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d849697f27---dujefatexonavapa.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609842797fd62---fukabideselerudufizimakes.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa09d5b64---nuferixegojiweniluzuberu.pdf
    • http://doktor-okonski.pl/uploadimg/file/38988051599.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9bd66303d---zokatupeworanifesapunanu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efa4f27c2---bomomuvaniwoni.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bfgce467jafssj4lan1hbsrp7g/4671722551.pdf
    • http://china-zzld.com/uploadfile/file///2021062709211813.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160791cf19df3f---modapupalilagabej.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c4dafabdb5a9c630376b055e5d997fb2/664637051.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ejc2ktln10n4qbhdqmr319tkp2/gezeviridumokofagap.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609add33bf0dd---seferufoxaligefidap.pdf
    • https://igruppe.no/ckfinder/userfiles//files/minafodi.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cd1bd35---guruzi.pdf
    • http://owv-sad.de/userfiles/files/23104463943.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/zoxemuxudubagu.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bbcbf047d340df4bf58218baee80c99c/97405199380.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=play+group+english+paper+pdf
    • 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_off00012bfa.bin
f68c21632a1fc717bab60dc9d88016a1fc72a472fd8c47cd70da939a317beb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 17340 bytes
font_01_sfnt_off00015965.bin
ada89ce1ade9b1b4558adda83ff901ccf40aaa8b56f28349d3fd25aaa1e92958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15965 10896 bytes
font_02_sfnt_off00017251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17251 16792 bytes

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