Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a841f9f36a3ee9…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 07:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14e11f653b491006c1c87511c0e6064b SHA-1: ab9f5674645fc4dc78f9895e481f553b1df62114 SHA-256: f7a841f9f36a3ee93e96f4faa198ab3d221ec573af75ad8dfd46b0655f0c9111
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URLs clearly demonstrate a pattern of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://laborke.ru/uplcv?utm_term=load+combinations+for+steel+structures+as+per+eurocode PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8fd5962b---golivemopasatodolikereduz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972457ca496---21471367772.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/bogotutubosin.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ffca0c897116b67a7db64873ae8c6468/75545001544.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa19e4a46b---63279354559.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94ea2a43e---lutusidanokalimakezasaleb.pdfIn PDF document text
    • https://digireg.se/upload/81171184729.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tiwixapepiwariboporux.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db1c128e28b24cb0b1d4c36528ebf88c/62266066565.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hicn8b07to2meog8ortog49ecg/nopif.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160787fb315324---gisurigadetanawo.pdfIn PDF document text
    • http://www.emailposte.com/pictures/wepiguxiregul.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/49715134153.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vuvezodeximefuxadaxebuxo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607185e3f0af0---97849126158.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086555c22bef---56434041319.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c83eb32e233d14c95d9f7ce36bbe9711/bunavasemukudo.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/tirapuf.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b807b13453a821a7eff16ad4001e10a2/59907721492.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/03c232e21b8f722d9bab64f708fa0784/kenemofuxivuvopifunuv.pdfIn PDF document text
    • 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17248 bytes
SHA-256: 86e4851a3251af5b5d41b8e7685f28ef194c06fc3070bf0f24c422492eb183f0
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 10976 bytes
SHA-256: 77b73362a3fb8ce367764531b3ebf26188f33a0c051d0dc1d7e928cdb05a98ca
font_02_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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