Malicious PDF — malware analysis report

Static analysis result for SHA-256 aade6f33b9cccfa2…

MALICIOUS

PDF

155.6 KB Created: 2021-07-31 03:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86f7f171e579a6c99595e05eab8ee93c SHA-1: 01cdff5d4f1ddf8bc71a203b1262f31eaa1baa3e SHA-256: aade6f33b9cccfa287985593e17de6891ed89e306b4d544e131347b91550f49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a tactic of using compromised infrastructure to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8c551bc8b2829020579d5cc8cdc24308/lewugibebenexuwupilo.pdf In PDF document text
    • https://skiclubraonbaccarat.fr/pdf/nomux.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031c0ba5bdd---matipag.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a10e24ecac4790d4e60602cdf503a757/14671769824.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/e3g1j6um5itjjq5bmuq92lbnul/vepepelosibutebugom.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/64162171517.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/maturutujazuvetaximefa.pdfIn PDF document text
    • http://standardamulet.com/files/files/dubegeteloxig.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081329eb1ea1---99102289557.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2fd94c3a0205f6b557887d190b8778f/lilikun.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5f8ljmn2okjofn3c1oc9so1bn7/mazogodunuwi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae39c113aa8---zilisadazewenikum.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/85adc5c085407f46e88a570e3495a2e6/lexujunol.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/jujobirutetesapimipeju.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0cgoualmrn5bmsmv2n0afq4s3s/17274631834.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4b349230---34142846374.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/46910945114.pdfIn PDF document text
    • http://azizolace.cz/images/file/fitufenujawajakumona.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f74c1baf---76476610841.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/87671739644.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/nalojafedobozofif.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/sezon.pdfIn PDF document text
    • http://bio86.fr/fichiers/2797182517.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4pr2nju9u65ri52jmghhvqjdts/jekedewuposafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=computer+animation+in+computer+graphics+notes+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE1D 11152 bytes
SHA-256: c0469770e7a2ba3ac6a97fc65dfd466b1ffa71b25f6388e386447ee441aeae7c
font_01_sfnt_off000207c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207C4 2900 bytes
SHA-256: 49eb4421dd4b82acd90fd1c9831bacbb77a0005d4f6fcb6401f9d19282965464
font_02_sfnt_off0002140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2140E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00022c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C20 20112 bytes
SHA-256: 1dc94a92344a0ecc20535e4e99dcf43860ea74afdafbf9ba3d52f18f2a0096aa

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