Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04039255b318111…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 17:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db62488b77a5e70e4ca6769863beb73a SHA-1: 90fbd64329a76a9046a6e027b6f816b0329e5939 SHA-256: e04039255b318111d238b312f8c530c89b7cf73d9884de23dfa6a15be5f4e27e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdf
    • http://hicoweld.com/shop/fck_file/file/movoga.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kupilisavus.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kia4cra6c5hd9p13rdrnvf96gl/pofexisosanusojevema.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/330bc4fe0d1b855c8f63f7fa02930d69/44173829040.pdf
    • https://thefertilizergranulators.com/d/files/nubagotujafamaveso.pdf
    • http://aire-limpio.com/img/editor/file/judetelumepuxum.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210917082210.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210923_172508.pdf
    • https://smilaxlabs.com/userfiles/files/bopevuvijasarel.pdf
    • http://achwvs.love-mrt.com/upload/files/parelowim.pdf
    • https://heritagecambodiatravel.com/userfiles/file/3249325325.pdf
    • http://dailygiasi.com/uploads/userfiles/file/85999292093.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a5aa30c3---kadogavaf.pdf
    • http://dgkno.cn/upload/buzodizisimuvetemerasog.pdf
    • https://arbormaster.us/uploads/files/xaminixeles.pdf
    • http://sun-green.de/ckfinder/userfiles/files/divuboje.pdf
    • http://lauraestetica.com/userfiles/files/96909653858.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/moxisufuzeribod.pdf
    • http://vitalchurchesinstitute.com/files/file/55930348169.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/37056605877.pdf
    • https://denizlihorozu.com/resimler/files/8024337675.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca2c6f645---nimebod.pdf
    • https://fsbulletsandbrass.com/userfiles/files/84018859352.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/56g2nhgeh5grvhecvoruaongu4/wikajetamaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=es+file+explorer+android+10
    • 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_off0000b3ef.bin
927bed54ed137fa6131b39f9bdf4ed1cf7cb5e64a96ce614133269857dd9eaed
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EF 10652 bytes
font_01_sfnt_off0000cc63.bin
62f9f3ec4e43ec346917bba8d1e1fefcce4fc5d6a90d3a179bbb66784295b57c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 17848 bytes
font_02_sfnt_off0000f9f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes