Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511be6ad13344bb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d274722aee7176f5d1fc6da60db05f82 SHA-1: b341e0c681a488f12d460a8d97a4ca60359c3de0 SHA-256: 8511be6ad13344bb35731d212524622c25a3ea35e60a12fac7a9e624db8777a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading malware. The URLs are designed to appear as legitimate file downloads, likely for a phishing or social engineering campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=download+spore+android PDF link annotation
    • https://korzo-galeria.hu/files/file/nizomivumemojatu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/78142467453.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wozomiwelarew.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136508b10783---lurupixoz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f6404bec79fb2ed0b456f5e71637403/nobejuzoluludififemiza.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/be58118767cb5a29865d194b670970fd/luditufevumufetiz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/12991991930.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dofanawad.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/41895583892.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/59953697905.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/84433072640.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/88319650857.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/65063543530.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xesumasudewibe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f792dc660---24163531451.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/73872965156.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xopoxigapifonezemiboxu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bapepino.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/tipigoworuwapovuvenitekim.pdfIn PDF document text
    • https://ivanamihic.com/files/17467446694.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/53457114759.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lglbrmrvcbbgnhvg1v6b7vtdf8/64322573517.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/29507989450.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 19952 bytes
SHA-256: 1ddca15da68ba8f6b9872b010d19c2c27b4ff1785f57320a266027af8235c820
font_02_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 10376 bytes
SHA-256: 53bd695a079351b168ad15edf3c2f9ad01cee7b1ffec8dc42320abfd4749b22c

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