Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63e1f6bef32cd5d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 19:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95bc48f4cab1c4ca95a955368aee4f41 SHA-1: 981bb86491cad78fb0d94254046fb78ad509e29f SHA-256: e63e1f6bef32cd5d9932fa7a14aeee39e93288def9f03a111922b6cdd3476282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URIs and link farm patterns suggest an attempt to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and associated URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=potato+pals+activity+book+pdf PDF link annotation
    • https://equinox-e.com/upload/files/75639426431.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/wimava.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29f44225d---jenoko.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/88010313736.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/330a26b8f27af3be99fc4813523084c9/22705736359.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/ridusomizigaz.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/12cf7bdaf990e106b774a6a9f2accadb/pomipuwikanebegamugo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8bd0bd6a4e8ad21f1b552c39f59c087c/13956201851.pdfIn PDF document text
    • http://chengzechem.com/upload/files/nuvujukawunikanakiza.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/baponekogon.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7320f237---23308877570.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a01ae06c994cfa039409549f2e5648db/gopikad.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16175552161684453b28e19ee4cad34c/vemuwifasidonorutix.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/62810072747.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/48360454117.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/tolik.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/boxezonomijuwixu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/lokujewezowemal.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/c21ct3ih2pmoapmdk3v07vl2gr/49658633620.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7mtom284j25sq4vhe4dcmuqaaf/20707890491.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_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 10688 bytes
SHA-256: 7967cff0f8723f5e1ed729b4a11f097b7fdc162996554c98b855e58a5a3ea3ee
font_01_sfnt_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 17100 bytes
SHA-256: e693bf1bf521f6042ffb6904138acd7b04f28bc9c7a846d0eb08f58b321ee183
font_02_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1