Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca198eaca9014f67…

MALICIOUS

PDF

66.3 KB Created: 2021-06-18 07:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9da99fd661a645f0f9c2ac5fe4348f8 SHA-1: 799428a0ff9f62c67aeae4dcd1beb337cb43cc90 SHA-256: ca198eaca9014f678dd716c966be72283f93a3f203cbf2644a1e465144552844
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=handbook+of+discourse+analysis+van+dijk+pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607656fea46ff---nujavak.pdf
    • https://bestofbucerias.com/upload/file/zinujixenakoteperi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d36897960---xobalovinukizemakumataril.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bea3d7eda---13639833447.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e9b5365e573006d965d102aca3657cf5/30711880487.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835d1b5995---12583802828.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c48e8517d5---50811564548.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b8dec880---vavigipudamefudisa.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c6fa83bf267f3637398c6ce93d32e58/88908379532.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lfk5734lgr5090m7n5fgvi8k1m/kumafexibasugodadolor.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3fcb30cb4c9b372f4c9d385bc6b25c2f/walotubowawip.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a683a3262a4---zitutegon.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f062a903cb---vimedekal.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/203f73b9e1b1215e45d0486a8cb8ea3d/gipex.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d6bd39d0d264d72eb1b547adb021e473/tinifekazexini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c284.bin
5929d58abc5526a57dccfc3db7247907a679e15ef79b32caf9f246bc7387a9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 5552 bytes
font_01_sfnt_off0000d581.bin
b50325db353f01f4651eb847762908461d2da0f3df1d3bd646f544d34ea005d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 11204 bytes

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