Malicious PDF — malware analysis report

Static analysis result for SHA-256 d282cd26b0e6672b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1228905a5851afd9d1dda46f796127f5 SHA-1: 9cf327df1f54b22577e841564ed1c2c6da2c0012 SHA-256: d282cd26b0e6672bc5f9fa8920b8877d1f34c9f91a02115a471107d8ab18712b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=football+ppsspp+games+for+android
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/68162580633.pdf
    • https://mobisteelegypt.net/userfiles/file/13833253957.pdf
    • http://hrudolf.com/userfiles/wokukoxor.pdf
    • http://bancasemecanino.com/userfiles/files/32733075459.pdf
    • https://laps.pl/userfiles/file/wawagoda.pdf
    • http://ipceurope.be/assets/file/76858341026.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/bijebuweraro.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/412d764e323d9468700223e7107842bb/kafawodawufakomunu.pdf
    • http://caratow.nl/userfiles/file/patagudalaxesewutovasor.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c819b772f---74837328704.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/tuvuvomedaji.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64824315098.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5c14447a---81908065689.pdf
    • https://panama4d.com/contents/files/58777017902.pdf
    • https://millinerandassoc.com/files/file/10760987505.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdf
    • https://e-ceramika.pl/userfiles/file/96808412969.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e3edfbc4---26838635534.pdf
    • https://membermimpi.com/contents/files/6391697165.pdf
    • http://centonze-vini.com/userfiles/files/lalajelikofunew.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ec91da2b8b057bf9a9e310adc172bcd7/nuxefegesoteguv.pdf
    • http://circuitoinsulargc.com/documentos/file/sevototuwuzowinali.pdf
    • http://vantaidongsaigon.com/uploads/files/20816040070.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ludofululixizuz.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_off0000eeab.bin
af5c160dfb4ede740989caa80c5377d60257ddea82b71bae5a7a0b33ad2b37f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10960 bytes
font_01_sfnt_off0001079f.bin
4df70e74b05d8eb1e81fefb2ddf5585f9328b4eb026681d5b71c96d2062ad989
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16868 bytes
font_02_sfnt_off00013320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16792 bytes