Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c56e84b60b50026…

MALICIOUS

PDF

73.4 KB Created: 2021-05-15 03:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b08de40a00c9aadba4e89837cec7b3b SHA-1: 446cfe4fd716d144babb4fe524ca026bf9640ccc SHA-256: 5c56e84b60b500265793e87e57a2f173c92267a32fa9434a209a64846ef27f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/105citjev3h3mnt1l4v4cermg6/sitobe.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/160b90863290b7e449125a13d381d6a6/zefezalonalivelid.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094608449ab2---xivotuseburuxakupimuse.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bkfj2evuipueb2518btfesa51v/tekivuwomasix.pdf
    • http://soupworld.de/upload/file/simewenamiviw.pdf
    • http://maasmartcity.com/userfiles/file/31906044241.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607513ac0d736---2564303490.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963009cef1---nigunadakaxazifunuruv.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bee68265352b46854954d8750c8cae39/1643258648.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7do07ipbn1okstrcmsk2bdqmom/jutizojetene.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/60e6212c243fe84cc70f9836420c3b87/simunasu.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bbd67bc44f50518838ad9266c4f69e13/warulelupijeteresiv.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9866d6f0b---81404119528.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2618c735---pexigu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093903f8d4e1---24705757564.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa728f6e9---89828818745.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1f2d2b65---34364046143.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e257c4a09---35226164336.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+color+calendar+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d2.bin
4c0578f71f7a62f9b171ce96799d26518d3260744ad4c8cdd9b5cb89ac8fb6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 4996 bytes
font_01_sfnt_off0000f5bb.bin
33c30c7056c9a944d3c85517adf893fdda602988f273a642f9db648241f411f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 10232 bytes