Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2d5fd8a2a96f22…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5240383b7b98a99bc218c38b05e9923 SHA-1: 78fac05e4084289f4e8645ef221d59d913160152 SHA-256: 0d2d5fd8a2a96f22d5507b959ab60b7827b4c3037feb43b76f0b8859ef85afd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm structure is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af263781ba---xifizomimobax.pdf
    • https://stradatextiles.com/upload/ckfinder/files/pufewotak.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175eae8321---vexararulabiwinipav.pdf
    • https://rijst.nu/userfiles/file/94295802391.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8fd85e039517fd8e8a207dd576578ba8/33456518998.pdf
    • https://peterdegendt.be/file/33153510270.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887233bb65c---94410962484.pdf
    • http://albarossa.jp/js/upload/files/93428688361.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdbc8651a7---pogiditeverafosumapujeb.pdf
    • http://ibconsulting.it/userfiles/files/bosomozafewiresano.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/puxapugalimisaximi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b21dc21141da0f599eb7f275379622b4/682875447.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e51b67877---46446939972.pdf
    • https://amatnieks.com/pictures/image/93428241097.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a913eb7ea26---zajevarofejofojoxurifekix.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a5d53e45ee42ecb380f5fe2bb900aab0/62877718415.pdf
    • http://apcmagon.com/userfiles/82163174918.pdf
    • https://heatingboiler.ca/fck_upload/file/mepuviwuzoluda.pdf
    • http://vipnjl.com/userfiles/files/rimepuvozemonanepozusuke.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8b5c26c76cb440f8fe430d051bfe3297/zerapenekexutaz.pdf
    • http://salukool.ee/upload/userfiles/file/radirojoxujuru.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i81fdvkq3mur4qu18fc59s4v4p/kazijazutijivibaxinu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/40ffe1f16c1eddb7463de4bb67e73380/budabapob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=latest+government+travel+advice
    • 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_off0000ea7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16792 bytes
font_01_sfnt_off0001028c.bin
f90b6a8a5112f389c73300bf747390414471314ab5c2701220a2bb856719f971
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 17308 bytes
font_02_sfnt_off00012fb5.bin
b9555c6fbcd54645aefcf510ad8c6ff11ea3289892c73f46e3beee118494a88e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 10736 bytes