Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09fc752a6254fe3…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 06:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 733c53dc9266f17302e51107099db192 SHA-1: f09c320b68fe4b1c26fee5486b00001297fc908b SHA-256: c09fc752a6254fe394d115d5f6432b73480c8cf7de50c3b07988d6c0486c4118
172 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a419d853df1---45628840291.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/dixema.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/44827993259.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/92737770026.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/17732570750.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d95d7f81d8be8ea7b9a682a48bfb908c/vusuleralan.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1d40e3ba---bunewanaraxubitowinido.pdfIn PDF document text
    • https://cncunse.com/d/files/53143818527.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5d785777---84357864605.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t60thct6cjp52iuopnorgfghkp/42905372903.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/84de5241e8e31acb1b2dc1b54cec2dfc/levobujekukim.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e7f9d9ba---lovezanegadinu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/xexezo.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/5839679974.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb6bb22f6---sujemererewotonif.pdfIn PDF document text
    • http://crediramasrl.it/public/file/58016074959.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b73b7955c---19755184075.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/guratedo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/n8f3574p31q85fai05mc06of2v/54638102848.pdfIn PDF document text
    • http://fruitvita.com/files/files/79651309075.pdfIn PDF document text
    • https://fallsplat.se/file/80214284425.pdfIn PDF document text
    • http://asfalon.com/__files/file/89689927902.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/goruwugefupe.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098dac94708b---bevododosutejaso.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c52e939f---banafuzenaluxivemiga.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/55566469438.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0733a466559307d5e16478b44d305351/13836023073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nikka+zaildar+3+full+movie+free+downloadPDF link annotation
    • 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_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16988 bytes
SHA-256: 63ef0350416151b7b6b7150e14d82c1c355f2dd505fb0821876bc9150c0b857d
font_01_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D3 10800 bytes
SHA-256: 18824a72fb880f0442e3ec536e859408b8ab298fc527e2ad34746e2c08f61ed2

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