Malicious PDF — malware analysis report

Static analysis result for SHA-256 24186b12e6c94ad4…

MALICIOUS

PDF

93.9 KB Created: 2021-07-10 05:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 208a26e467d96d46d3a0094ac2b702f8 SHA-1: 10293982c8a8699b36653b7f8e4c1ba8477909fa SHA-256: 24186b12e6c94ad4835bed90ae665077c650c9b37e524264ef6ef4032f0ff200
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade security scanning. ClamAV detection and ML classification confirm the malicious nature of the PDF, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=ftp+in+computer+networks
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4949abffffb6c4418ef4a7fc78d64b53/69128227209.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7teo8574si659o1epbphvpi5tl/sirotanajexow.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb768a3d74d---16651835665.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160759315641a2---14476109319.pdf
    • https://festival-bg.com/media/ckuploads/files/zuvefemaporunevamiworenar.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/sibabitobe.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lmo8lle4es2m7uhdb08lp42bdr/35571925917.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ba501af7---bafezebutigari.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a97951d2ec---xiturak.pdf
    • https://alternativecarrepair.com/userfiles/file/sukewudoz.pdf
    • http://cuoredicane.it/userfiles/files/29041626736.pdf
    • https://virtualpulse.eu/UserFiles/file/beposur.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ngi6rec3v5moi1ulvlq064igdt/7570519147.pdf
    • http://solamsys.com/userData/board/file/roniv.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ed2d34kpn6qm1q4a8coe8pfoq0/vajewojekivugudababuduma.pdf
    • http://meechoktoolmart.com/user_img/files/4650610189.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1fbf02b1---69016755933.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d898e1d1f10---4877848196.pdf
    • https://yellowstonewildlife.com/55950147506.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/543e8f6647b436e2bb06db428f37393e/bamirinoxiladadurafuxuge.pdf
    • http://baigeleather.com/userfiles/file/gokotizavunir.pdf
    • http://absolutelyneon.com/userfiles/file/doluvivipas.pdf
    • http://carlaschroyen.com/content_docs/25815813644.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076034c3115a---95945763371.pdf
    • https://heritagecambodiatravel.com/userfiles/file/selodimojuj.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_off00010c0b.bin
9fa8cba42c216e3caa0806e0bf41b4b463a9a1006bf5e3b922408aa428777cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 17608 bytes
font_01_sfnt_off00013ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 16792 bytes
font_02_sfnt_off000152df.bin
4909f591cbb5a4d2a0534da2aebf87d128774a0e6b7a7bc1c6c6e6bedd0b72c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x152DF 10584 bytes