Malicious PDF — malware analysis report

Static analysis result for SHA-256 89001bcf7a55a188…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8c8d5012ed49df44338ac8804846cfc SHA-1: 6784724c7e4003b126cb1abb2d0badd261ed2858 SHA-256: 89001bcf7a55a188a92e8add0e8d99803f3a4f62b1cc06f6e93158c5fe421ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kaptenhoki.org/contents/files/fisafuxugadidebokugalije.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425d4683529---zasukazexibidaj.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210919_7F59ABE8019C9E79.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/14054837869.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b816861a0389a2199331d85ffcbc85f8/34338414763.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/925648212.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/somikiromirebo.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/75965284387.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/xalukisiruvu.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/mutigeduxujujaxoworagere.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/gegaxa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/98c2d84dcf1a8455d015973517766242/56481797996.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2359lhbrn4ps4r48hqorap8tb2/71247903546.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/diwabulekem.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/18221186321.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/81449488862.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/teranolosuxeji.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/733vrq163k87jodsgetn4pqqo4/vibiwosilolopogakedu.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/talele.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/388c8909dc43f8cdab107c8b5b978789/diropibebifi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e44635aaa---xatuvibenewapekikumogapi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b43e279---bumikupurexumojuxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cursive+writing+keyboard+apk+downloadPDF link annotation
    • 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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 22344 bytes
SHA-256: 7181f01ef88afd913487680b9b0f90c8bf16aac06fafa2444f633b38c10c6222
font_01_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 11196 bytes
SHA-256: 29fadfe4567b15efbf4d296e998ea312f17033e59babda73efdc67449c94e6e9
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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