Malicious PDF — malware analysis report

Static analysis result for SHA-256 c698b0329ed8c26e…

MALICIOUS

PDF

105.3 KB Created: 2021-06-26 03:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 089bb675e2d9c387b5ce4ac0716f94f3 SHA-1: 46d5d860cc590b1d6b90da20eb375755231c84ee SHA-256: c698b0329ed8c26e87fee7c90d75db099cc10dec278a5a30522bba2ad3238ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user consumption but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • 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.
  • 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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c415da445eb---2841898729.pdf In PDF document text
    • http://primaneighbors.com/userimages/rasefuxozakinigosux.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c959d91a3da---43647701375.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670dfed19c---revitexok.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/dukowimokoborezeritiri.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/10187318616.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/59399333488.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d44335f---41608680532.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/dt26u4l2rdbv5gnl15ibjm8785/78047649788.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609106496514e---37419785726.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/kizadozifuv.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/54780c63beb6d95311ea1a705fd51210/19904727201.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9860f9d501---pukoxazogonixavokuvo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/belijonozaxajexe.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5adcfc93650a3db14c3de264b82ecf57/25205295925.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30b4b8b1f---96009133910.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/witivivi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6a42c11f3a959a43c9fa79efb42db19/nanudilapovawijodel.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/47edeb82cf8d6b08f927188e0102be5e/85393657427.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074767ce948b---26372666623.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/30707133969.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/922872aaf22aa88bda19000f53cd843a/nesunajupukuwabipixomido.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/52804073588.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/k784ea8jdcdljij29c34m7q6t2/nevesarid.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tatarugejolunifu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072590156510---tetomifuxalakodexirel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=c+programming+basics+mcq+with+answersPDF 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_off000134ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 11176 bytes
SHA-256: b30f19f0d1ca77aaccc99bc5516698ed89fbfda37b9d4bb0a9525ccd6b376bf8
font_01_sfnt_off00014e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E70 18480 bytes
SHA-256: 98e2b80e7cc53e21b27388ce3657b3034d0aaca0a0edeb3ad2ea22dde4feaacd
font_02_sfnt_off00017f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1