Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aabcded49be54df…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 06:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65d76edd30077ce6e29b2fedabd19bab SHA-1: dbaf666dc388b3564307cabb31c54cce7e9b350d SHA-256: 2aabcded49be54df2f38a41ffc115fef08058b6edba6b7a12d1dc99427a5a88b
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites and disposable domains, designed to lead users to malicious PDFs. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's intent is to trick the user into installing remote access software. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ambulatorioveterinariovianello.eu/userfiles/files/gatosawesuvovi.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/60qmp7403d9rn7toap6v9059c4/sasenadiperimiwowa.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/mimazabuvivepezoxesa.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/degerudasebizinojatuzu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3q14i8a5lpguu3cdrffks0vtv4/55237160451.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/86781816579.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xizumanirilezorime.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e2859d44---jatugomenixigaxad.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/35734042071.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0e0b9541f7368e2f634adbfb002d6b1d/wunovatudedipizakeku.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/95551883059.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7f6612e6d8e7a83265d3d70a5d18ebda/75807538511.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b36bafdacece609893ea75af98566fe5/vaveneji.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c544d3bd6---dinonidukenomoputu.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/fagowojazirapog.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d32c62d09---zolewazivinojamenipo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/76274636593.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/89040276875.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/27a9c7343e1b502d79bde3de0cc17106/nevorekofedumegadesos.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/wetepaxogid.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/efd993f756aee29a3a1d1d979a1a951f/nijeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=takeuchi+tl12+manual+regen+procedurePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 16812 bytes
SHA-256: c2b2caba93a1c3e0ef4cd129a6b01dc86b3e2e90bc8fcd6b33481363d93c870e
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 11120 bytes
SHA-256: a6542d71a0282e82d74880b2b8769ddb2f40ed0022be03fd5c26d5047a6c1949