Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe8dc4fccb15630…

MALICIOUS

PDF

95.2 KB Created: 2021-09-07 04:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edb00bf87aaeb44c1f9911103952aba2 SHA-1: 3df524f320a6d51e0e28d95d2ff47e937828e580 SHA-256: 0fe8dc4fccb15630d95d7fc6b2e2526697f7c9248ee70bfa6fdf503ad3ed1066
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, potentially to phishing sites or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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=canon+750d+manual+focus PDF link annotation
    • http://karinameal.ru/imgdish/files/42612834683.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/gokewe.pdfIn PDF document text
    • http://packturf.fr/files/duvamaluzajixipit.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/regav.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/39235308824.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/093f2c671fa703bc2fbff6c64f24aef3/76481735835.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u4lp892s79fh1hmhuotvbdb572/59072242579.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/6066558123.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ebd623ad---5034144587.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/40878974332.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/tosidu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609909d9639a9---bojejefewovawozutelosuf.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb3d655cb---jisokoziwalegesirepin.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/ronusezawawuv.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210726023413.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/27713308660.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608667409ec38---loguvelasuluwapiwomexosol.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68c4de7a0e---tiforezevalokilot.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/36570583330.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/91417980a563b555e5a5242841ddc743/kuxosesabimokeki.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lakaju.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/92a5939e3b92228cce037758b9f9bfa8/75604912912.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e39bf050---vososog.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c4446d8afe6e2ad95cc8a4c69c1fd9dd/94557514328.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6e2buidmouffg9la6kcvtr0bod/voposeruvoxiwogirusit.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_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 18412 bytes
SHA-256: d0325a65331259572c59a40bc0ca43d3eba4ac3a02b3b45e83c03aef32953527
font_02_sfnt_off000154fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FA 10652 bytes
SHA-256: a1a2a663f8d446190191033406997e467d6124f27f5d8d98ad29a31acc7cfa60

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