Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76d4194336e5d81…

MALICIOUS

PDF

86.7 KB Created: 2021-08-05 17:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3538b0215e44c48494470ffb7b90341b SHA-1: ea2842f0fb7a5c2b1ab95f9d7758164a0d2b4cb0 SHA-256: a76d4194336e5d81720d82234f578da8237a13092d007ebd527e38493178eded
196 Risk Score

Malware Insights

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

The PDF document contains a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential harvesting or malware delivery. The presence of multiple URLs pointing to compromised websites and link farms, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the overall pattern suggests the PDF is designed to exploit user trust to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=pmp+tools+and+techniques+list PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788206690b6---bifagivoluwamota.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/mupuxogenaxemab.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/24386502518.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/kelav.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194490db1a---77949167838.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g4cchjq62cvnendnlch4mousg7/kuvoginexikesoposilixu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f66e2017523886acffadbe0f377f76b1/wopigibuvu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/71371855665.pdfIn PDF document text
    • https://ahha.az/userfiles/file/59821791690.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/14813812772.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gemerazi.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/zemolix.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c0ca1ce46e0665e1c4dfe162aa25752c/tiwevojanosevalete.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/4576927360.pdfIn PDF document text
    • http://peak-experience-japan.com/vavezalesavu.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f2cf3c990e6363ee2045f4463d12af1f/memaxeferelijelaza.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/98106313351.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5e6a3190---zugekinesa.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d19b8c7---wujamisufuluxopi.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/sawutarabalaxeninavob.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/jekozuvovurifipewirog.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5dafe8992cc6f8bed4cddb6f6ada8c7/bidiza.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5eb3834e61b63599f388bf3213f4a8/jivatanuwivigifuwazerenib.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16460 bytes
SHA-256: cce0b31b02768c9daf20ffb54fab5e3dd6f42b00481b6129dfc747d123866642
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 10928 bytes
SHA-256: db6b68e2aa07f0dd02f6b0000874953a41284ef7e01f6ad32f04b2bade0c754d

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