Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da25b71e9275aea…

MALICIOUS

PDF

84.9 KB Created: 2021-08-02 07:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61815ba1ffb811e954c1ef2cad12e303 SHA-1: e68864a8be5aa2ad65f18bc74fc6f1ec4b32b171 SHA-256: 6da25b71e9275aeab059b79df42194edc0b5d75bdf66249d6b499ee35d5d092c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/10udpgrmq14rc208lfrpm663dq/kokadetamesuwuxana.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa12225df---53274765493.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/41386354928.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63418891161.pdf
    • http://kokocurry.gm/userfiles/file/lusalatuzidot.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/11c054929ab854f162cd7277a33e5579/76890999159.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fta45117bv0i08de3ljkeidcdu/zezimebonexomivijeviris.pdf
    • https://pmms-online.com/assets/file/19290461960.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a2e0e4a482cbb56d69787a85ca5dc636/39027549213.pdf
    • http://creativetechno.in/userfiles/file/69012314075.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fc33b8e22---kuverozisesabod.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/lufomuzudizofalekirivilu.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0451ebd66---xobakafituteduzolamuf.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/09f0d0cae52d3315023aa9d76cf28c01/95974055394.pdf
    • http://niszczeniewaw.pl/userfiles/file/lolizurowuvabigakenil.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d3fb2f0ee96a9b3dbb220db40e30f086/dojivamog.pdf
    • https://angelsstaff.com/uploads/file/mexefekutujol.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fb467f3d9---kikolagumibezomur.pdf
    • http://cdhsalumni.com/clients/28864/File/60321218907.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+hack+free+fire+unlimited+diamonds+grab+legit
    • 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_off0000e10c.bin
30c5dbb5b108810b822cbbf6772fa7b7eed3cabed176da0a37cdbd01d8ac6c13
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 18104 bytes
font_01_sfnt_off00011109.bin
ebabd1b3f4db100393eea7196683e2d56c8a7382aa7ecae1ee7eb741ec4448db
pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 11332 bytes
font_02_sfnt_off00012b57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes