Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecde05e6fdab112…

MALICIOUS

PDF

104.2 KB Created: 2021-07-06 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43fbbdbbfdfc338780f9232b49a38ada SHA-1: e016901b9bfce7f13c5c36bfb947c2a8210655d9 SHA-256: 0ecde05e6fdab112bd4447e1fbd91cffa625d48b32b799a7808d11ab3eab6857
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to various websites. Several of these URLs point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://krisoc.ru/uplcv?utm_term=another+word+for+more+than+half PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a262b07e3b1---56162491779.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7b15464e650d8a78d5e24c9afc879458/fixozixarimifixemudi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/tamoz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3cbf1277c29e03a0baba39f514a8cc75/mijubaza.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/711625921.pdfIn PDF document text
    • http://fruitvita.com/files/files/tulitixevakuzudexujutok.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9bd22edcb---tatatoserilatekapawakigot.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d15309e5---tuxunam.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/tivibefi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21f3fabe90355171a07dc07216651762/87847655732.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b954f4d---xudedesoribimazobafizakin.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/favisamewuvoxamamiga.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1cd294ad532d38c079b235a75fe26a63/18076628894.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/71k2k57lslkkj5in23lsifeo6m/88185047428.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdff6a70c---28946473862.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c71218e827a---16568931230.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ojud4jupg0hvjocs3tprvjeqq3/zofapujesizizatufivip.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/pakamonajonezagumagile.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/08042d8c5d96478255d2fe11db611d99/similu.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0a53af6e---muwovolezuku.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16094254709b07---temunefetubovikapirezo.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210626_7BA6CDE330604636.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a419cab53---16426983514.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2dc70bbf44f653cfae4e8982b915e34a/pupigapavulamotaluxu.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_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 18420 bytes
SHA-256: 32a8994c7e1ee426d127b82b2206dca52d482b7fcb38286836bb8d875a9f9708
font_01_sfnt_off00016242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16242 10424 bytes
SHA-256: 9258f65e3dd0d90ce1ec971a72cc2276151d7a43c62e374fcbae324883d3124b
font_02_sfnt_off000179c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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