Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a0b42cb7a630ba…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 428179daf8b560ca6f4158783b28d33c SHA-1: d39c2565f793e3a7a8d3886789e31f1950645641 SHA-256: a7a0b42cb7a630ba456f4e31bbc2c7f40351cf61e05165542e5c0724a7539f0c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious content.

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 http://helder-effect.nl/userfiles/file/34034998939.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ud28r55n06dv00pd03mm59q8rf/xovebi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/52395030995.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/mafulufoxa.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/c80c80jge1uk9oi3fq2c4dsmbc/21667844119.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bobelexitisufapodasatabiv.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/grjkn7u04d4kjo9lsu1npibau8/lalosamomukefoxewap.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/3175976291.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088debca3912---5370006642.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8971900f52---59290614989.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/21497658374.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/sabivonadatoxes.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/mupeweduduliwuwukoralitet.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c254dd3e8e3---22693380565.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/60392997567.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef431e97b---ximelave.pdfIn PDF document text
    • http://birdwatching.sk/media/file/womadedogetenofodiramawa.pdfIn PDF document text
    • https://kaparatt.com/images/File/pugigipupikoxo.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/sinodepabazifosazi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/53455974827.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b94ba560b---nepife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=romsics+ign%C3%A1c+magyarorsz%C3%A1g+t%C3%B6rt%C3%A9nete+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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 20136 bytes
SHA-256: d4b07f2420aaf18364aeff0574fd34164f509d7ac1b81c08493b761a78bcfc07
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 11684 bytes
SHA-256: 12b83a139ae198181feb6d7c0ebb03ad5fdcc90f02e92d35d5fd9c15573ba6c8

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