Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309fd4757a991fd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29192724024897a4b4175c48fec10c25 SHA-1: 8751d7c36f920e1cead6e263a3d0d3394c601aea SHA-256: 7309fd4757a991fd328232d9d7908567fad5eb90f1c4ca7dd31229afe5b89dd9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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://datajournonepal.org/files/ruveriragezunelinad.pdf In PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/ziseluvedevit.pdfIn PDF document text
    • http://allier-genealogie.org/File:/62619370370.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/82821864878.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a84713502d9---vojabez.pdfIn PDF document text
    • http://marymo.ru/uploads/files/23273768364.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/wajida.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79708af00---zipanaloneselepak.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe026c3522---mosanejelusofafowasaduvil.pdfIn PDF document text
    • https://kaimano.it/file/24163857391.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9c225f1eec0a6b5223d0e318d15480e2/45279221041.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8a936smjv38j16ubpjb3phvs0n/vinubabipubezavibab.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nemuxoweso.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511195655857775.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc561417b44---jisurumomopifim.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/11345880383.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/114aad019f6bb0df3b3f2a939b71cf4b/51997159117.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/supegetenudikimem.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/96801956209.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/kapenuxukelapowodilowab.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///21288774800.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c45cb966135ed2c6f05d92612d2a7042/vobavonifabovuzekibe.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609854fb9f929---tuzosopibesitozatem.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4133e4bc0e88005fccc58645d8b358da/falarabi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34189636480.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/84110045974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=test+for+carbohydrates+experiment+pdfPDF 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_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 17016 bytes
SHA-256: 3347a0896f2c9538e65573f70e00b608b5a9bdcf47e6e64fa1cf9372cc04d51a
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 11160 bytes
SHA-256: 1560b5ccc82042286acd228247f9d64f5a0f177c1c25b3944690468b06260574

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