Malicious PDF — malware analysis report

Static analysis result for SHA-256 f594e680b46bd468…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 06:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e53102988723df047eec46de16becfd4 SHA-1: 50a2092210898f02e18243259b0b3bedf3f90595 SHA-256: f594e680b46bd46824512b4bfae6f03588bc375474297df0affd04368032c608
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms, suggesting a tactic to obscure the ultimate malicious destination. The presence of multiple PDF-specific heuristics further supports its role in a targeted attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rozgarnetwork.com/ckfinder/userfiles/files/45224497891.pdf In PDF document text
    • https://phr4u.com/files/88164989478.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/84669362561.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76fecafd15---82644553398.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/34792515607.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867d62dc9b2---lajolawowenikas.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hmdvf9vkmdo4bpdn6jfle0dd34/bomina.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/63361218527.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/92987659341.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e0c4541f7532035f4c0cf8f6973a02cd/69229252248.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/30741725920.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e0fkkn677asi03rgtosm1q0vjn/detikenok.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/29118963224.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/73681556475.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eaa2f791---pugolinabafavedisudutepo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/36373135602.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/98656377571.pdfIn PDF document text
    • https://skspiti.com/userfiles/files/sewadufo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b9846de73c6740d06da0d69aff480dd1/sirejub.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/tafumuropumovimesigej.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5c2ed1cb---54500220056.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/23264718406.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e8b365786---84597416938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=speakout+pre+intermediate+book+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/lekigozodetug.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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 20488 bytes
SHA-256: 77bb9416295c4df8415643861b78da1ada10bd86ab35f96593513677973c377d
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 10852 bytes
SHA-256: a227b0fefc383277015a35d9541634df11c95c11304d0b6b468435c3dbcaa696

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