Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd4f5990c5835e0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 01:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a78511f2678a37a34804be3817175bc5 SHA-1: 4c7ea7ae308cc4655fa14077f0cee60afc72aae5 SHA-256: 7cd4f5990c5835e0e25c712cc167b8b88b888ce70f215f4cd78bcdf054011aa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://topstec.com/d/files/vovetil.pdf
    • http://spellenindex.nl/images/uploads/wemawinexilovosiroperi.pdf
    • https://manorhair.com/uploads/files/202109011538055911.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6fe2b01e---muxumedewilepixozu.pdf
    • http://gavionescodeinsa.com/userfiles/96485454497.pdf
    • http://calisnt.com/uploads/files/70541905894.pdf
    • https://htijsr.com/userfiles/file/lajuxumegup.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdf
    • http://taemyung.com/data/upload/file/98494634746.pdf
    • https://iphone-odklep.si/vsebina/pirafavuninoweniget.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/96560413858.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rocug11p4mcqmmnq3i3abe5075/buwofigimasepoxamunekev.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04e6df7e9---95788557460.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/tepifuwope.pdf
    • http://golden-candies.ru/webroot/files/files/vojuleri.pdf
    • http://hooleihomes.com/cms_images/file/15525176369.pdf
    • http://paulgraphics.paulsfashion.in/files/3810771090.pdf
    • https://hotel-la-licorne.fr/userfiles/file/63864716229.pdf
    • http://diennuocdanang.com/uploads/image/files/78197645155.pdf
    • https://heatingboiler.ca/fck_upload/file/30417232103.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/89323560822.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ignite+me+full+book+online
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/79323060907.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_off0000ddbc.bin
f059813d7bc1ed7b8c42d62e25fb1572d02afc25351e73ec31ae798cd15f0332
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10408 bytes
font_01_sfnt_off0000f540.bin
46f31536c648b07202265a42def85efb6ccaf651fc1fd5d9fcef40ae7497dcef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 18028 bytes
font_02_sfnt_off000123cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16792 bytes