Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d67ca4740dc8188…

MALICIOUS

PDF

84.3 KB Created: 2021-08-28 12:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2798e3fb6f0fcca5315c4e05c3434df0 SHA-1: b1b2c30bf1ba7d8b8819433ba4c45998da46021c SHA-256: 3d67ca4740dc8188cd127ec34891783d2ce040d145abee4899450a9298c7f477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and the nature of the links strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://dh-life.com/ckfinder/userfiles/files/43575157836.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cj4kd6ogarg8v813m46vg5snih/dopudogejikodilopotodoroz.pdf
    • http://budohurtsa.pl/userfiles/file/67114913189.pdf
    • http://slpclassof67.com/clients/45391/File/33304021344.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/97586611036.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a331efd74---bosojesomodezurawe.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/85ccb89eda3c93342d49f4d57e618aaf/39919866412.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/vezeporo.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cf0a7326fc705f254f5c65adf5a1f8c3/fikedirane.pdf
    • http://ecohost.ru/pics/images/file/99001106626.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/52693970692.pdf
    • http://diysmart.net/userfiles/file/pajegiramepegijulureme.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/tubivoguzolekibik.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/78716633990.pdf
    • https://geniodelweb.com/file/92560998730.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e9beb7110---wamumovusu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160774ada0dcb0---29256415868.pdf
    • http://righetti-ticozzi.it/userfiles/files/96246714944.pdf
    • http://faceconnects.com/ci/userfiles/files/6675702523.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1f61691ab---kasabatatuwaduxe.pdf
    • http://merklink.nl/site/data/ws/files/16267226204.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/dece9791dfb0f3137b8c2101403f425f/vanuv.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c29faba3e---90331497873.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/as3m711me7i0fkug6dlct3dn07/25525475067.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/1960977534.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zoxezabakabenimilitek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=batch+file+to+run+exe+silently
    • 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_off0000dd8c.bin
3ef15e4ba86275603cb260fc69d143be93b8d00881d392b35a58feaae3c8acd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 19448 bytes
font_01_sfnt_off00011029.bin
8913ba09810df0991879e06dc95417ce3995d941f241dbfa4c75af6fa3943bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 10804 bytes
font_02_sfnt_off0001291b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 16792 bytes