Malicious PDF — malware analysis report

Static analysis result for SHA-256 99145299bdc7c39a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 09:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0cd49957137399887a2263da4e0ba81 SHA-1: db6b8c77b77d9e32868f722b949e3fa93d5deb64 SHA-256: 99145299bdc7c39a0de9d4ab81694b55c07f99f33bdc50df005e229ba6ef429d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are typical of malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=do+you+really+want+to+hurt+me+text PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c47b8ee2---23934291406.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/99167902521.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/54684518021.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/vunekozipinutujetixugog.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/susaguzej.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/lurot.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/fufubefesajavojo.pdfIn PDF document text
    • https://landbar.com/upload/files/6576275997.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f037b8cd67---daduzovukofaxur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d344f75fa7---97239487234.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cccc1c7d6---10641889716.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c6bc6ffb---54380697966.pdfIn PDF document text
    • https://kaimano.it/file/71552792275.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609138ee1af62---tanazimekidarudoposobo.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/25545454905.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bexowisoziw.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f2435745e0e---febajovonos.pdfIn PDF document text
    • http://capri.lt/userfiles/files/98823522887.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vewinuzev.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab143384d1b---43694971649.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/fowomufedilafo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eee5019da1863daad5354769d1fb5d9d/tiruxenalatag.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/mobijekasirenotelo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/vejoz.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/bovajexe.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/60381432948.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_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10516 bytes
SHA-256: 5cdb36cfd6c93a15b2503dd0e5922143dba02b8d35654e2461794611d9da64eb
font_02_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 18440 bytes
SHA-256: 50e56ff5b87c84779e68bb1a39955cc10f90341a1dbbb73009aae0e97ef214bd

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