Malicious PDF — malware analysis report

Static analysis result for SHA-256 900703d2c7d9ac9a…

MALICIOUS

PDF

80.2 KB Created: 2021-08-30 15:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5997cc5910abb7bf4db0d29027e00ee9 SHA-1: 6ab07a5429fac3a15a8e2c8041881e5bdd0fc3a4 SHA-256: 900703d2c7d9ac9ac04311c8755f174f42c73dddd59b8d211a4c3e8adbf55aca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious URL, suggesting a malicious intent to redirect the user. The ML classifier and ClamAV detection further support the malicious nature of this file, likely acting as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=3+out+of+5+percentage PDF link annotation
    • https://luminex.pl/upload/file/74189374391.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/19809911168.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7um3tgru8so86nas9dbpqu3qi0/3895848918.pdfIn PDF document text
    • http://flexicourse.cz/res/file/muvutefozej.pdfIn PDF document text
    • http://schturman.ru/files/files/kedodolaxuteputixog.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q8mtfjbc0ao4g9i3o5nfccfs7b/37025288099.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/24469385847.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160819205a67ae---zuropuse.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/811079743.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/67509001337.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/02krdl12j6tgp579at5dt3vvur/muzilitawol.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/luj8gf2f0rl50ab4aa3mt33vvt/68662818657.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cfda9d80c25aba7ff34610ffd6904cf7/wiwizaxoregijuloj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/futojisebajarimemarutofi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/h960n2s23t2fsmgpclvkvo09et/webutok.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa1e7934e---1561590976.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zojiwosulav.pdfIn PDF document text
    • http://fitviewer.biz/files/file/38047000084.pdfIn PDF document text
    • https://area5srl.it/file/wemove.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393d97b7c4---viredapilafaxivizurujuz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fa3c63fbbb1d9fe1d1e23fddf9be71ad/loduwexe.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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17588 bytes
SHA-256: 9c780a59133e6e68397f91311724a2e578d47e0b66ceb1304df39f311a9f7d8b
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 10656 bytes
SHA-256: 1cd5bba8f7928508857073c95a92009a47bf92baebccdc8f2e5b497e74b77e58

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