Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece71256e3d85e76…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 16:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6e5c330af49dcfa3a3b827e7b598990 SHA-1: ceb21e9ae9c4bbe6c96412fb0a5cfeafcbfe8802 SHA-256: ece71256e3d85e7689b840d4c60833f7d36473336a63a1bb7cd73d79cecf6c11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the idea that this document is intended to trick users into downloading further malware. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/119d9a95f5cf304f9c9baf8049e0ae94/jididuwudupivum.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/957243cdbd1c1793cb72bb512b3f2caa/vonizesutosibesanibew.pdf
    • http://enovosti.info/ckfinder/userfiles/files/68234687102.pdf
    • http://ajivikafinance.com/userfiles/file/97685240668.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6b25b682cde10b9885849b7ccef5767d/bulepipi.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/xatodakisiwoninomudipigo.pdf
    • http://limuzine.md/userfiles/file/razijowofelitedejumisi.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8111d04bb072c91322d087f11b83b8f9/41918022252.pdf
    • http://cy2hand.com/userfiles/9009434604.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae3e46258---37283072693.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c003ea2166c---mosujamesagogigaj.pdf
    • http://euredit-editions.com/userfiles/file/53800117397.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0mk01op5h8l6ko9h1nh27il898/39552347691.pdf
    • http://chochosanencino.com/uploads/files/92483841592.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/bozoxepugije.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/delovizewapoba.pdf
    • https://feltshoe.com/userfiles/file/rovokitofigif.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/tuwodipedimibuvatetimoz.pdf
    • http://www.520amis.com/upload/files/xivewasugudamerufepifuraz.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a9c2f59d---83790330579.pdf
    • http://langeline.com/ckeditor/upload/files/63691654200.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c68b64366---zudesojovav.pdf
    • https://np21bellapalermoshopping.it/file/zipekovarewijojobogawa.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/urj75ih6adhlrjl4u8v1b5rik6/zitijeba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fundamentals+of+modern+manufacturing+6th+edition+solution+manual
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9de.bin
92e2c531be4b26c9d1c2cbdb484ad1beb9f0621d739b7bf36bb3affd38d39f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16180 bytes
font_01_sfnt_off0001038b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
font_02_sfnt_off00011ba2.bin
07b402b49113be6ab2d2394fe54eb526ecfb7a79e6ac7e77d8ee1294eb08c277
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 11168 bytes