Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c71abeb5573baa8…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 18:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7345a6c2b5635c0a594a9cf2f8d5615c SHA-1: 036db377fc1504ed59648eeb6db378a3ea3071d1 SHA-256: 3c71abeb5573baa8cda8e7ca065b8c1c791fe4d066be2c4139d1efa041fac349
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a compromised CMS upload link farm. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The malformed stream length heuristic indicates an attempt to hide malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/djp6fnu0g9aj339b4epj8j92f7/zijezuforezipikenaxemik.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d09d99119---91038143309.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c5984f17---bedonabomolusomavakuji.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rupezedopuvefuzuboxebe.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/er0n5qt8rv1dcfssjv6actkjj1/93285645135.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/gawate.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084578b10c67---potonajerefalasonivi.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/90496014640.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/98091349535.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8979c56279---75659424810.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/dasusazimafiwusefeninus.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c6ci47v2g42eeod5jnsp3299m3/tutivavomanonesuvuf.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/fabidikopawatomoxaxadu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6528f1216e---titopugesiperazowezuziwu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/770c004d87d4911a2b1019fe5360b8da/16538426772.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/ruwibodori.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/44e50caf71055edfeaa7254c39a0e92a/demuvibikotolo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea54623c8---94405207333.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/83164812871.pdfIn PDF document text
    • http://4bx.pl/public/file/jozazusedoj.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/pivis.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714749d4739---zajom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbbc205e1---80039201449.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/tijejejofuxumubugoto.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/43297399220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=champions+of+azeroth+quest+linePDF 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10960 bytes
SHA-256: 4d47b179014c5203212cc0cf011d70d28b497490ed1159b91d60d4c9f00f65c6
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16976 bytes
SHA-256: 918f304c3ada520939ec868c373df7da62f00abb14ba81c70fb5141a4b258063

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