Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93a3db74db4ebbc…

MALICIOUS

PDF

82.0 KB Created: 2021-07-01 12:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea695889e0f48fac9bf114921223bb47 SHA-1: 1885cda420a2d7a42282a6e5d0d6c53ef15f14ce SHA-256: c93a3db74db4ebbcb9ed2c2f43e060f569e42a7278ff96c81d98284cc595dbc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The presence of numerous external URIs, including those hosted on compromised CMS uploads, suggests an attempt to redirect users to malicious sites. While no scripts were extracted, the overall structure and URL patterns strongly indicate a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=slope+intercept+problems+and+answers
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/lavovavaganijufoguradad.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bf34e6d57f84b8de626556a9133e2232/60514219146.pdf
    • https://mobiligennari.com/userfiles/file/23491551478.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/56046274648.pdf
    • https://melz-feu.ru/upload/giwilikikujowupuz.pdf
    • https://aykutemlak.com/upload/ckfinder/files/fawinekaxariritexe.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160793d8cd893b---80757657943.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50deb73936---kosuparekunulakutudopovin.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b3ee576d96c54dfb5caa5b409fdde069/gowiwamolunow.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1a356d8eafb893ca1acd76e96b6e2857/retazurixoj.pdf
    • https://whiteplacard.com/UserFiles/file/82326616254.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/49ffe3c757fb9ebbec68d8798693c80c/migatobilewar.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/zivoniroliba.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3b5cb857---vovafowewejamilufozewa.pdf
    • https://colakcivi.com/userfiles/file/39624442920.pdf
    • http://stroisvias.ru/userfiles/file/mimerelumujoku.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/32cd171ccc0d334c3b2e50ddbf389816/74042685913.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac620bbde6---kuxupukebowobubajapuduseg.pdf
    • http://archimax.ch/dynamic-images/cms/file/puziruseruwenuzirosugi.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1f53d0c8d41739348a60f367934577f6/9315954399.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e0c44178254d9e5a8ced8227e48a8b5a/tijokomonufukowugup.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f845d564f2---62735088419.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa48836f6---xuselebiliduwig.pdf
    • http://amphorabeautyclub.com/campannas/file/fazezowujaxefufol.pdf
    • http://www.findvoters.com/userfiles/file/26643444863.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db61.bin
3bf12289a211f4a0f6b97ac1989deb2c71b553121e3d9a4174f0d5401b8384ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10976 bytes
font_01_sfnt_off0000f49f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
font_02_sfnt_off00010cb1.bin
d1e00869547be3747c475ea0c7cfd3e4a7a7f131beacdac0b8cd13a2d56cf493
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 17440 bytes