Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d80a4b89f175d62…

MALICIOUS

PDF

83.0 KB Created: 2021-07-13 12:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fccfbd81ef466da61f86e40d33bd90d0 SHA-1: 3ac041d48cef05692ce0fa48c0167e1afecd9f57 SHA-256: 8d80a4b89f175d62c013457112de84c9179eaedb66e0757844c58d71ecd2202e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates an attempt to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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=how+to+read+better+and+faster+norman+lewis+pdf PDF link annotation
    • https://imagebeaute.fr/userfiles/file/pefosasetilimasibexu.pdfIn PDF document text
    • https://pmms-online.com/assets/file/33393730144.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9b9de13828555673ebe622b2726a78a4/majupavugowikepujawepef.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vajuniguruwadaxepu.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/jidirimimomif.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/kolumajanatipixonaf.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d2d41ad435fc99e135c16d4293635888/85643034238.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/jomibesidibugedatejewe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de39997494---18590092157.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d140effff---penekuzevakoganijo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97037b69---mewum.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5831cc7fc36674a408ec4c6d88d0a9f0/20669670352.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/78704739978.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/855c655894e4422f0b460c5424888ce6/gukag.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/381782094.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/kexesifunerunilozudedoj.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/21780917167.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160803ab222a4a---wakudezelilipaxewe.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/redat.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9bdaed49---sagezamamexek.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/37f21e11b968103e349ff0d6dc8aeba3/3365961629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7ca47fa4---fetutar.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/84108130640.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d259ec278c7cd2a4fb42fc16cf0cf6da/38297304265.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079174729d8d---xatifutoliv.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10876 bytes
SHA-256: 9ab1dfe9d322dd730cc9129d3bf695fac5e648c9377ebe1b3a1952d38ab3a1f4
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16992 bytes
SHA-256: e901be74aa43e34fef730bf7f6829a9a17d991c9f563dd5a2d69f846dbf9af43

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