Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53063eae5bc58bb…

MALICIOUS

PDF

96.0 KB Created: 2021-07-31 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7fa989060069e488498404dc137ceb2 SHA-1: 06b5c7460cec1ad6f945992a199e5b00b36a8ea6 SHA-256: d53063eae5bc58bb466126aecb66685644d806ae4a65796b41b8c0fc2c146260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=manifiesto+anarquista+anselme+bellegarrigue+pdf PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b201646777c---92931286673.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b90289131da53c8b2cea2d1a2c0641a9/70762968855.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d91a5a916---nujazafowitigofefemakaz.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/63031036166.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/88240639663.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a05da7cc3a6---693317109.pdfIn PDF document text
    • https://mauspro.net/upload/files/detuludepepulusokij.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/28294432032.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jesukukuxujukenupejo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/gasixizid.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fm4f12f61s4k0cmmf82vlb0n3v/78541214928.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/26158212793.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608240bd8f491---garebasupaxe.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/1023654710.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/275bc30b9413d1fb2896d79f571645c7/wumeluba.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/37263261021.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be16efc2f19---pazezevasiwaresuzikin.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/60164211751.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f26f7cb9b---xuwarikobara.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b66656b2---xuwapilop.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4b82292e---nebajotixiw.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/9745789781.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1b78b937---92888880189.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/nanapona.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_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 18412 bytes
SHA-256: 4702952e819ac0f5b3100656807305f1fb629d9f26761fcd2116f7746bbf4896
font_01_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15568 11220 bytes
SHA-256: 9a0926fe9339a689959b657a530394afd89206d55a5c68c42a632574c772de8e

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