Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9fb5aa89ddd148…

MALICIOUS

PDF

80.9 KB Created: 2021-07-18 07:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eebf682d64419f9bb7e262061632fa0a SHA-1: 13a101cfaed28c43c7f9aed2b0bbebc6faedc043 SHA-256: de9fb5aa89ddd148f9e9a0f1a8a88ad55785afacf0a4d995cdee91e5e1ea0b8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs and link farm heuristics suggest the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://eichler-kammerer.de/34091820470.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/88079560813.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2b4cm7sm722i0pgs4vf352q9rp/56402524616.pdf
    • https://jahanchart.ir/data/files/file/sukaguxofuz.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/02a3526fb57a7f26fedf9508aac7ee3e/kaketodubegozupudosip.pdf
    • http://ekolojikweb.net/upld/userfiles/file/8218212090.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/749efb9ba1f14180357813bdf97d592f/23155105055.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893971636bf---jiwuvowelazi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0460300c1c4567220c60d23ef5182ac4/jekeboma.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0af78d7d9---jepati.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095398a17cb5---tipimexisugezagatedirubes.pdf
    • http://comlark.ru/userfiles/files/zevejapuzobevisa.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfccf9136c---xemotodarutefunofowesisem.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/puguna.pdf
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/xifewulimitozazokisixoni.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b6ee2b53a43a9e3f66cead348c89af2/72192984083.pdf
    • http://c2r-auto.com/uploadfiles/file/2021051917412373499.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c1522f9baa527d2219a7bce989bac538/zavadeledibo.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/096f3d466ea43881c196cf8401c7f2fe/9689866277.pdf
    • http://fanti-fitness.pl/uploads/assets/file/77436953389.pdf
    • http://fsanaq.com/upload/file/210714051158265626iofg93n9mi04.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8cf5228c8c42bd65305cb9279b31c6d9/kupiwu.pdf
    • http://augustaelectricalwork.com/editorData/file/31958836466.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/zepefugotifiwanelosujor.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n7h9goojia9p5qk5r56vpusl4i/kizarizokofuzus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=girl+you+know+i+miss+you+i+just+wanna+kiss+you
    • 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_off0000d9b8.bin
cb25254d30a5035f9530cd2a1809cfe5ff7cc7407e6d8ca80581da777a30c1dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16020 bytes
font_01_sfnt_off00010387.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes
font_02_sfnt_off00011b9e.bin
db1e74b5313007ce68da48bfd7186b3041d8093119a63d133cde7309b254ed3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 10696 bytes