Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17d827bbb787de9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1110ada4afc2b7c7e622cdf884eb062 SHA-1: 02f98cfec3138ab98231b0074702ef5e10831ced SHA-256: e17d827bbb787de9d8cd014b607ca0059241358990c5c40fc51292af9949227a
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on compromised or disposable domains, likely to facilitate a browser extension installation lure. While no scripts were directly extracted, the nature of the links and the ML detection suggest it's designed to exploit user trust to download and execute further malicious content.

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://ketchas.ru/uplcv?utm_term=free+vpn+chrome+terbaik PDF link annotation
    • https://whatproperty.ng/ckfinder/userfiles/files/60355706136.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/99050528376.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/24093138804.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/11398781839.pdfIn PDF document text
    • https://razredna-nastava.net/files/81981589401.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99111269846.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/siwerolaviwe.pdfIn PDF document text
    • https://pcetravel.com/files/file/gatixujabiwedisunalipifu.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/tufiwaloxat.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/71124690492.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f4c72523---wuzomakodalokusase.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630899973/file/bidivuz.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109102238342672.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kudekom.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8eksd2avmb1svt8gnlcihncpf4/tufidekaxadexeze.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1a10e7fd---sesarepixixaron.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/94255330710.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/54574294789.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xovosewezuxegasit.pdfIn PDF document text
    • https://5uempat.com/contents/files/47670301870.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pobifokuzupalomabojimidon.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/feliroxenaf.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/rapurigarugiga.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/53188673047.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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10700 bytes
SHA-256: 55683e60a325a2a5eae6c290529eee4f9c288502f123660109e16acc39020632
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 17496 bytes
SHA-256: 4b06555dadf6281cf476bbadb6640159ed747108a6be2ec5f547bb4ba145e702
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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