Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ecb8501e476f05…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 05:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87303cf0b94ab09ea7cc0df096fdb858 SHA-1: 7a211bcefb9910485c924e0e669e5cfcfbfb98a8 SHA-256: 24ecb8501e476f0588e50b3ed141c6ef7c280294c5e668d305da109e9f8bbce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=oilers+schedule+2018-19+pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/77063696762.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/aecc6d8dbddc205101e6ecce375ebf7e/25017402088.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/52863951378.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/nolezog.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rezimifegafa.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/33152558874.pdf
    • http://moyamoya.center/images/hand_uploaded/files/93808860913.pdf
    • http://dyglas.com/userData/board/file/dasatavuxed.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0c376e18---73164924937.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5639f634---78860323777.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749f90ca9f4---vexujagutix.pdf
    • http://vce34.ru/attachments/file/pepaguxuraxuzugenesewa.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac836c913a0---22160694162.pdf
    • http://goldmustang.ru/files/files/fututexelokerakujulevala.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/fe97bde6255108909c509118963ebd09/50258770210.pdf
    • http://aisef.org/uploads/userfiles/file/file/zifepe.pdf
    • https://classconnbio.com/img-jacson/files/zudonalukep.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/efc3af1c1369d5b4a056caeb3c8b03a1/lokisutem.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9408120a5a---54748668160.pdf
    • http://saluteebenesseresas.it/userfiles/files/59686885133.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ahjdq7dk08q76492lgjm9b76ln/bumujumekakobatelutazus.pdf
    • http://malifer.hu/upload/file/731800495.pdf
    • http://papianiarch.it/userfiles/files/24170915774.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/26356337903.pdf
    • https://vibangnhadat.com/uploads/files/38185821197.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_off0000c7a0.bin
be2b4f9cf05b1c8b3223ab05982072897bb945fde859c8cd751428e240e081ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 17444 bytes
font_01_sfnt_off0000f4d7.bin
8531fb6ee221b8540981f30bbba5309f9d7b98ce37f5d498bcd73d6c53014a51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11064 bytes
font_02_sfnt_off00010ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes