Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddda6a618c0ec4c…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f88d52cb8da52d45221d321b920679e1 SHA-1: b5f674523d1f98201ee7d8c95bd06c9bb23ab239 SHA-256: dddda6a618c0ec4c9970c2819c593bc5fd52edbd7fe8ae4f2d20e138984c0237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the structure indicates a malicious intent to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pusheng168.com/uploadfiles/20210702092223.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/wisegapovozutupukaguv.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/844985eb634697459f26fcbd0f01a644/mebuzipotikapig.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/depiw.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3aad5bde6e08c562e9a83c6b44c83006/sumigubisonobes.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/dudimajurotesija.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b7dfe8ab36c2f4b6f1de0c8bd30d1944/92445992934.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/u0g3jhj28abfgja6rngu97sgc1/80669640291.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b7978931---88815341945.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/74665058934.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/potududupesidenabinen.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/71372229822.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/4512464201.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd8e74b5e---pupukugofusafodotudepib.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e099e0d8cc---rosuwigewetuvuxakeso.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/38663481757.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/sifigijekovozaj.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lujonesodubagufizi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u744ppg7lo32o0u6ceaiuubcfv/zipefase.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/buraguzodedudumonesux.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/14733225846.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kuludob.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941101ba251---3117163209.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cde8350922daca8edfb02d0af01bd1dd/wadubavof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=small+towns+in+kentucky+to+visitPDF 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_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10824 bytes
SHA-256: eb9a8cb2ad5d953f8187e155c8adab6a35daa03cbcf3804d23a1379bca031908
font_01_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16900 bytes
SHA-256: 6b2d4ac90cb02d902dab2222bb5d8c240065a409aedd551b2dd382c45bdae739
font_02_sfnt_off000149a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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