Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c00cc6185e8905…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 05:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 70d866af2323bde544e04dafb69faced SHA-1: 27362d0ff2463e421ffe13e39f715fb7207c031e SHA-256: 81c00cc6185e89059cfe5fa9f17a91881d6f91651fc782ff1ed370566f045935
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm on disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=android+location+permission PDF link annotation
    • http://canadianrockies.info/files/file/66140425443.pdfIn PDF document text
    • http://mc-opony.pl/files/file/nidiwa.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zuzitukigoso.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/13586314915.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kevowumar.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/86001746051.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614290fc47963---86032330548.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/51606057529.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/ruzenovupazu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/eef0b72985e1aef95f40b190f3bf8a5f/21953653040.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/53153060412.pdfIn PDF document text
    • http://coachhouse.info/assets/file/55100403210.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/gosejo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wadojoniziguranufo.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/13367277337.pdfIn PDF document text
    • http://gr-chem.com/upload/files/55318992225.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/wajulufuxalujalit.pdfIn PDF document text
    • http://sissonne.hu/editor_up/sivowikimunosubupibug.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/79450498433.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/34321972914.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312216b4323---vapixujaribat.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/64613283380.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/mulilofupomaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/67607d4f5389cdcb9108133fe1375d31.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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 16980 bytes
SHA-256: b0ec4c543c20e5fffb85fc72e3a388805cdb185514dd4a773d320a7b0e629b43
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10656 bytes
SHA-256: b1e73c9a9cc1e209cfd8e2ac33e968147ad3d629b2f65fb714cf251fda7138ea

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