Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcd50ad3d6b1212…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 23:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b84de87e3d534d04440ce5f6762c6cfb SHA-1: eca33b9b95e106fa409921fd155967c060755b99 SHA-256: 2dcd50ad3d6b121225f3e6ac7240d410d027ccf3fa08110050a021f18a49893b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some hosted on WordPress upload storage. The embedded URLs and the PDF's structure suggest an attempt to exploit user trust or curiosity, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=harry+potter+aur+paras+pathar+pdf
    • https://mobile-translator.eu/app/webroot/media/files/27931938336.pdf
    • http://bycongroup.com/UserFiles/file/losililamusud.pdf
    • https://growyourmoney.in/userfiles/files/nobudusijujivaxirob.pdf
    • http://encino.ilovepokebar.com/uploads/files/49681363101.pdf
    • http://www.bongbansaigon.com/uploads/files/liritaxubokufad.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vadubenovaterumafek.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16133984093050---49973359642.pdf
    • https://paron-rebondir.com/uploads/files/99903608306.pdf
    • http://picassogift.com/Uploadfiles/files/19268514892.pdf
    • http://gjbbang.com/userData/board/file/jibije.pdf
    • https://underworldgear.com/upload/users/files/75551401060.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/24955809001.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ef8a39da---xedekagubogejatu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d173207c---lunuriwoz.pdf
    • https://tanvietnamdinh.com/uploads/files/memopumanafaledaworafe.pdf
    • http://ajtoablakcentrum.com/_user/file/rupimubakef.pdf
    • http://usa-ex.com/images/blog/file/pubazoloximudovuli.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/81752078744.pdf
    • http://budohurtsa.pl/userfiles/file/75876006314.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/tedizowixorawegodokoxak.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903041008510331.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613798e0c3fc8---36715971917.pdf
    • http://mikomisushi.com/uploads/files/48730187843.pdf
    • https://thaiwoodengames.com/files/upload/files/ligezukux.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_off0000c14b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC14B 16792 bytes
font_01_sfnt_off0000d95d.bin
3a298724efdbeb908f149dab6358a6dd88914eead22d07b62b7c4a2bfd80a017
pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 18592 bytes
font_02_sfnt_off000109a4.bin
05b6bbfb79b4519f7014126205410ed27eddb2b75403e02c4cbb8a638f95b169
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10556 bytes