Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad06590bc5422efc…

MALICIOUS

PDF

80.6 KB Created: 2021-07-04 07:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 250e790b2fed03895ce46363e30b64f0 SHA-1: f0e00b5743dea04fee2a5d24037594b0c0991524 SHA-256: ad06590bc5422efcf768415fa3cac75ad5d1f7b9da351983171493bc337e7d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=infinitives+with+question+words
    • http://lawrence-spruill.com/clients/42275/File/texixebisisumijabut.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f983bad033---79265022930.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/095b8abf54b28ac302e0bfa2acbd71bc/lovonegidu.pdf
    • https://gifarlcm.com/upfiles/editor/files/36929801417.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/0jvbv1s5cvc44cvfocfri78nc0/28952559090.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ba5d78916cb3ed2c1b2155fc33d628ec/pajapivomuniripef.pdf
    • http://urgentcarepb.net/userfiles/file/sudegimesofa.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160cdadc09149f---posovezezogo.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bff376426e---60069818952.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ba0d3f5410307b0723c9a2207c59bd2a/jenavifiko.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/89720129950.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/80da2e00ec265188a008ec6dde24a81d/1682301437.pdf
    • http://beloezoloto.ru/userfiles/file/28258291577.pdf
    • https://hansenlight.com/UploadFile/files/58012250698.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/norejaduronolusenufoputap.pdf
    • http://ristoranteibucanieri.it/userfiles/files/82565395373.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed36f27e4b---kuzabariwipegipogil.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/614ecaedb88e385c85603b3dbbc4bfb0/mozuluwinipibawinovemejuj.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/46060452677.pdf
    • https://hashtag.school/userfiles/file/sewopemow.pdf
    • http://emauto.lv/index/images/up/file/gowulujujoxuzomute.pdf
    • http://blesk-stroy.ru/userfiles/files/tisejeva.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cmtdnh1f8hm1s630j87i4alit9/99448107608.pdf
    • https://dbjadow.pl/attachments/file/31398535763.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_off0000d990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16792 bytes
font_01_sfnt_off0000f1a7.bin
790cc23fb107a4c0b91dce3b8e00e3cde028b90e57f8deae9fa73ef6606aee73
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10592 bytes
font_02_sfnt_off000109a0.bin
81c5be40c2373b3f035a5a7c308d0f0ea20cf716e2985287be71719878ac72ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16712 bytes