Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19e5a1d154f1f49…

MALICIOUS

PDF

79.5 KB Created: 2021-07-13 01:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcdfc6b033c07022ac0c7d1bc2f0720d SHA-1: 78461882f630bbe83ab25acb2ab0f3ccca74cd1d SHA-256: d19e5a1d154f1f4923c15845cec98a3da7f4e94061609881e77b1adef0abc6b0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c7a4a01a---vawalejapotirufonej.pdf
    • http://handbook.hu/upload/page/file/guzedotibofizefufe.pdf
    • http://www.ecvbrass.ch/user/web/file/33269997459.pdf
    • http://vangphugia.com/userfiles/file/53634898033.pdf
    • http://dolphinegypt.net/userfiles/file/ledukidajelizumosunejit.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f50f8f852496c5ad8b47e801385803e7/48416857567.pdf
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/xotonezaxelako.pdf
    • http://worthingtonpark101.com/userimages/mubanegi.pdf
    • https://alice-immo.com/userfiles/file/47004754813.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f29b903b733b1c46a8b270c5ae0bef4/95858490039.pdf
    • http://accessprecision.com/userfiles/file/26132833311.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/02beb21a1a22f6355b5e88d617efc7ec/xamavebewifelujas.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/bovuvenevegebazozajefux.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7a013f7bfdd0a49c2d650159410e1974/gopegalisajufipuwudasozup.pdf
    • https://m-isc.com/userfiles/file/2068445216.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b7c42ec7---15807837428.pdf
    • http://farmaciafoglia.eu/userfiles/files/jalakejazaruxarijolirufe.pdf
    • http://ahcxdq.com/uploads/file/081336011902.pdf
    • http://atdawnwelift.com/userfiles/file/34254122975.pdf
    • https://atphp.ch/userfiles/file/26345228442.pdf
    • https://accuratesearch.com/userfiles/file/luroruroderi.pdf
    • https://papiratisk.cz/soubory/51238465183.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=william+ball+a+sense+of+direction+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a759adb8---48146691722.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf0.bin
cb85421ae059b752026f96fb556d76e696162d058a05cadc0856cd7bfc84e6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF0 10916 bytes
font_01_sfnt_off0000d5fa.bin
32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16356 bytes
font_02_sfnt_off0000ebf4.bin
6a10c7ccd21978e550efefe705e7b8b75c3f3cc1db5b158d770a431ae5b714f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16412 bytes
font_03_sfnt_off00011685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 16792 bytes