Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1fbcbdb7070deb…

MALICIOUS

PDF

79.2 KB Created: 2021-08-24 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbf2ea58cbaf895daa09672635a34879 SHA-1: 4b1244f67e72347eb964e3eb0aca8216375fd092 SHA-256: 4a1fbcbdb7070debb85477174c055e1abc62064b27ee2d241d019f79915588b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=aimbot+for+pubg+mobile+ios
    • http://exosportsante.fr/ckfinder/userfiles/files/kerupowujebisepus.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0457e978ed3f23d0219fbaa7dc991504/65483559446.pdf
    • http://csc-020.com/userfiles/file/20210625062736_iwlgsb.pdf
    • http://botosani.ro/img/uploads/file/febaxisojinodola.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a3ab6e9b2---79472830100.pdf
    • http://amandamaitland.com/images/file/21457691198.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/38046750198.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c7b29d23---vuwugixokewi.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/pujemetunamupivodaba.pdf
    • http://sattamatkapatti.com/userfiles/file/89089900869.pdf
    • https://alarouba.com/ckfinder/userfiles/files/zepuv.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/99547811067.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f1a99c71c---rufisutesijewoxidije.pdf
    • http://www.zywawiara.pl/pliki/ledekagof.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/510fa624d83df3440acd1c833641a3df/kawufotolunesewapoge.pdf
    • https://goodline.by/userfiles/file/veriwulemadumumurosixa.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fizadutapavevowuj.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/31c5681dc043f723a870ff5dc2483651/jotuzenezul.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/77085558782.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dmel5l53psifotv2u5m83vpc83/dositoxanoguletir.pdf
    • http://land89.com/ckupload/files/wiwigiwununaguvetuleko.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a119d17f714---reloniw.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc298e5bc06---rexowiwenamidog.pdf
    • http://kapsalonindex.nl/images/uploads/81530534236.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 16792 bytes
font_01_sfnt_off0000e774.bin
8ac9c23722e860243673cdf7a0958da5e39871dc60c551e9390c1c382c443b83
pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 17928 bytes
font_02_sfnt_off000116a1.bin
f0b7cfcb8ed4646dc0bbf519ca84ac52881fc68e83c011635ba8fafae018384e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 10656 bytes