Malicious PDF — malware analysis report

Static analysis result for SHA-256 888739f889f505e2…

MALICIOUS

PDF

93.0 KB Created: 2021-07-04 03:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 846b23ec788866fff8b4d4dffc242daa SHA-1: df2cbdc27fa9869acba6accce6522f5e544ee4ec SHA-256: 888739f889f505e2a79a018258c0821f3233dd620db5d548e5f40611d166d5fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide direct textual lures, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9df28b1caab305f16f6abf2964c035ef/83289321891.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7qldjo6bbeobgpaiknqhc5ii9p/79522156512.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58004531554.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9a5dc57d---41645678280.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/pusade.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zojavokipigefoduxumetuguv.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c79520e9ae7fd35bdc77ac552b801d8a/84926274839.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/55331413127.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pmsb8kmp2esi1rdm74r7cgvqt9/vevotibolajumitujeliromap.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/rilufuropowegamelew.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31c59cc75---11409707920.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b9c28328672fade4958d93529c61a8dc/44048498617.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084f418c4d5b---fusumafokanatuxuxawuje.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i2d6es7qvdh5g5iqsdfka0b4mh/sodozolokajidenutiru.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pe5j4haekasjcdcpv7knml9q1/5627801511.pdfIn PDF document text
    • http://sns.hu/_user/file/75415114781.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff90d6283a---sajage.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/vetanu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2bfd89b44b058e81c6a862f327a28f02/16811139625.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc1359e22ab3ab95d43cc9c668ab752c/jilamoxegujopuxi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//59454327567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=which+type+of+soil+is+good+for+the+growth+of+cotton+plantPDF 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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 17376 bytes
SHA-256: 0862afe2dbbdfa059ab61a26d22f8a9d7560deb775314b2052f98d408a49be76
font_01_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC3 11092 bytes
SHA-256: 5e6000c25a25847269fa5774ea987dc3f0d7b5aadf731235790932a6f03eeab1

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