Malicious PDF — malware analysis report

Static analysis result for SHA-256 55550a50b1b9b781…

MALICIOUS

PDF

82.7 KB Created: 2021-07-03 02:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4e38e321eb84743cb5119582398f013 SHA-1: ca85dd3cff27cc1b9c37d4930211a068fb372fff SHA-256: 55550a50b1b9b781048c2cea387bb355ab05fc3876e04157af4ebb9a5e01104d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nirmalujjwal.com/public/ckfinder/userfiles/files/56298774403.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8c5ojmfm5rj8fcsts9u3ee55/73189621928.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/620933cbf9721ce4ba7622bac9b6cc24/15041287058.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0536a9bb85---85185388195.pdf
    • http://hotelclinton.it/userfiles/files/30015102826.pdf
    • https://mps-india.com/userfiles/files/15698642940.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d50e8f7ab---teruwolikapewuboguragusuz.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a7eced6a96f1a220df67fb8000b7d8e0/16081673707.pdf
    • https://rybczewice.pl/userfiles/file/xodakujosaxikitazezagi.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ddfa12f133f9f4fbe351615a4a9c483a/buvudedejinaxas.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dqqtqp1up86pivnf2v73dp75rj/50637262400.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929dc118936---62240528902.pdf
    • http://slstudio.it/userfiles/files/33783081753.pdf
    • http://spy-military-labs.com/userfiles/file/fazowuxagemovovi.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/33548483594.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081822a3a3ab---pumuwefiwomupatanifiwo.pdf
    • https://zivotzaokny.eu/res/file/didojilupakakokowejixa.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c2c3nudljf692o6cl775a9pbp6/gotowuwefiguraje.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098da93f103d---16126541144.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/48746075431.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20e3db00c---venabomaxutigamifara.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=llc+business+meaning
    • 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_off0000e38e.bin
47ee6d5fac63654de8696e8d0f5d21a6bbcc0c3928bba8bf9ebd28f1f8d1fb90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10452 bytes
font_01_sfnt_off0000fb2f.bin
43d0cb5e617485068549ff2b9fa1a93fd9edbc0a9942594ca953bb06bee000de
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16612 bytes
font_02_sfnt_off000125c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16792 bytes