Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02a6dfb4cbc8cca…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 01:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fe77992e6f5325aebea20b9b96ad62c SHA-1: ed86c1d18d343f08b04cdf75868a025e245be89f SHA-256: e02a6dfb4cbc8cca93180cd4617dbb70fb28649ca2969a311faecf8214dcc656
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=logarithms+introduction+pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ivv77mt4unv71m0tndprnl5137/wumawadumowalopubivi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b4351d43---vuroterezovukipuribab.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e5936e41---fekoriwotidotemuraf.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7b0acced3d93382e1a2bbd980f0ed66a/51681120525.pdf
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/93184774730.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3f094c7feea25eeaafee0202cb61f2b8/pugezutorawowavolavawev.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/340b792336b64c0746cd91a6c04b65b1/kumat.pdf
    • http://madmojo.com/fckupload/file/76184262995.pdf
    • http://asijskepotraviny.cz/files/file/39982941028.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923d016a384---maxenemaximidivekozuxoj.pdf
    • https://evermoral.hk/upload/file/1625489246.pdf
    • http://skazka76.ru/pic/userfile/6598664913.pdf
    • http://gesundezellen.de/neu/userfiles/file/zutorazerozemupar.pdf
    • http://mega.kz/media/upload/files/39344769421.pdf
    • http://onlinecommerce.bg/uploads/pages/files/44304871802.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709557b7614---79517163985.pdf
    • https://condicionamentofisico.com/arquivos/file/vabowowuninex.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5a7472cff5f45727ed773ce3262e35bf/tefepile.pdf
    • http://mintaialuminum.com/d/files/jedipotowaguf.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/jojaroloxifotavevexixugok.pdf
    • http://bawaconstructions.com/editorData/file/gifisopasunafobez.pdf
    • https://petek.biz/resimler/files/6872554501.pdf
    • https://ipic.vn/userfiles/file/rimexinasisaxafukiranog.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ffa8ebf89---99981236805.pdf
    • https://hbfilm.ca/resimler/files/23122727717.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35174289373.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_off0000da79.bin
82f0ad09f2c2a9daf9e5ca4c659fd541fb88b885db81bf6433ddccab753f08a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 17984 bytes
font_01_sfnt_off000109a9.bin
76b8c96ba5d82200387c4fc9f641efb518e8d458ceb1df0975f6657441960cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10948 bytes
font_02_sfnt_off000122a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 16792 bytes