Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bfed12edc41ae3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 01:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 895877ba38b1d786b252b0dfc681de08 SHA-1: ddb8021a38883ad846bbcb3f147ea8bef12fea4e SHA-256: 40bfed12edc41ae37dd9d71c9073bee989422751fff8063b20b5157987b29e58
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware delivery attempt. It contains a link farm pointing to various compromised websites and disposable domains, designed to redirect users to download a second-stage payload. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b072da62f0---96497445775.pdf In PDF document text
    • http://157.230.241.115/image/upload/File/senokefok.pdfPDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f93842294---kedoguvowigisebipobere.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/36848565775.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bded468a5---30751923625.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c4c86c79be0bcbde358865463e9d9fca/rujazejedej.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/newulamigejewalenozaxam.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rkbbjrid73gurmqkaak28do0l6/21589916474.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d1d938edb---57706705976.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608549db69391---meniwibemo.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tuzerusepupopowexote.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d077a2bffd---posejuzekobaveda.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61d29562c---68374662960.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/20141752747.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93e5811181---xetomagavekira.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90d1da224---xavanovexamuwowezegozu.pdfIn PDF document text
    • https://efnnma.org/files/file/laminusutitexazudatezobas.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-7/20210607195515551041.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kipibowivewumawel.pdfIn PDF document text
    • http://abpaluso.com/upload/file/25582047632.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d897d63665e---99269729642.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe1224beb---48196764999.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/93257693219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tnpsc+omr+answer+sheet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 17292 bytes
SHA-256: 3e6582f5a01e8f3625f036defecc27da01306a6d80e048058b1a9ab0e151be40
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10796 bytes
SHA-256: bc4d454196a65bc797471e66a2730cafa96874a4f6ac7996cb110002d678ac8b