Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b47769267c8bed…

MALICIOUS

PDF

82.2 KB Created: 2021-08-29 17:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef59bd201fe136e482b76863b6129ec3 SHA-1: cc219373bc477ef8a9c4ef19cb6397322a0719a7 SHA-256: b8b47769267c8bedbae46b26d86976face05961a9039d4c11b463a22862f39ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=sk+fruits+frome
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7232960e2bb6ae544f62ac2910dd8967/89955604552.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850c9e3bc41---69478111778.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c2b7232a---69565225655.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/lamozewuzorik.pdf
    • https://adasms.fr/userfiles/file/48831843001.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/2646724778.pdf
    • http://elementsgogreen.com/userfiles/file/93470603556.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e80636d---woxorimovajavosunes.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6854efd5995b45f1bc90febe14f3e941/85291859984.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/46842492165.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d994f0060bb7691240375368431e4af/sarawoketura.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03a381fd71---puvixejoxava.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0d969076---6008006990.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac41ca9792---1541687460.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8760b4e7---49209263878.pdf
    • http://abnicum.com/files/file/fulideponos.pdf
    • http://gewald.ru/content/Files/lizuforitixodewitimoj.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16112a50ab9cdb---46321240622.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/a7c2e97f7fc6789bb967d33a5e6c8ec5/89515790541.pdf
    • https://ivanda-commerce.hr/userfiles/file/14187635349.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2efd685ec4f279a956b4ac3e5b9fb9b6/30128136133.pdf
    • http://donghotam.com/luutru/files/banilinolixurugefogavu.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793cbb9d485---gewawomirimiwopitawi.pdf
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/xavozufusewunudefed.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.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_off0000dcc3.bin
f7e6a3ffe1f624b4c3aca5632d18a486a97425c5dc24826baaa84ef0cdc33056
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10328 bytes
font_01_sfnt_off0000f420.bin
65919df05dc459f8832186ba1574050fe38c4e29c21ba8246382ea3d34bb24df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 17740 bytes
font_02_sfnt_off00012254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 16792 bytes