Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7bb3b8f1adda74…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 16:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16e640b11e404ba1c68ecaa9df75e3ec SHA-1: e88febfbdd725e6addcc9f929d2b202e80ba3eb0 SHA-256: 4c7bb3b8f1adda74c4677b88021cd4c0a26f47ff1b78b3501b31a38fff73e5be
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common tactic for malware delivery or credential harvesting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrive.ru/uplcv?utm_term=download+mozilla+firefox+for+android PDF link annotation
    • http://happinessgown.com/upload/users/files/8868770933.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/43603056861.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133967e06d6b---rajibadoxorimixoleb.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/97503690164.pdfIn PDF document text
    • http://mfcpavpos.ru/file/45098232349.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/38611127311.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/39053416059.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3474a54a---pepiwisegoleg.pdfIn PDF document text
    • http://prmakeup.com/Image/files/tepufezadijam.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79567898465.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/18698935748.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/97709571101.pdfIn PDF document text
    • http://chayka-svg.ru/files/bajitefipiseposijigojawoj.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/50322881072.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d5826007---xuwijoxofavixapud.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/lijonaxuweforote.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vijafewuzevaxupekovixos.pdfIn PDF document text
    • https://chptravel.ir/data/file/96701932017.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/fosozajad.pdfIn PDF document text
    • http://learningkey.org/userfiles/39982250862.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/xasareje.pdfIn PDF document text
    • http://jawarakreasi.com/file/90623692141.pdfIn PDF document text
    • http://chinalabware.es/d/files/xafugamiberukuri.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/ziwokevapoboj.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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 10500 bytes
SHA-256: efb8a73c5f3a9c8f2cd10e8833ff02bdcd996ff4ffc6ee79076604d71b7ae057
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16720 bytes
SHA-256: 94b64a6626a2e2f711eb383aaf21b048dc0d994e8645898533ffd94a42c1079c
font_02_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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