Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde69b5417cffe3…

MALICIOUS

PDF

78.5 KB Created: 2021-08-22 18:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f56e899da208ca991bb5d5d53eb26b SHA-1: 3b5f39b37055a46b9bdf3fa2e5669e8781530626 SHA-256: 1fde69b5417cffe3faa0e3e3905a2684a392a08bd837e5ffd0d159ec339bca4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, with the URLs likely serving as the primary attack vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=download+nintendo+ds+romsmania PDF link annotation
    • http://2ds-creations.fr/userfiles/file/toxonidokagufibinura.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/83089206442.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xonosamapegegokit.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210809_2CEB2893D14267C0.pdfIn PDF document text
    • http://short-story.ru/upload/file/98125364673.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hl6l4alt38uolstvfn5ao89vl4/42151965443.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/74831060666.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/83554916154.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021723136221008.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/wirijarikupudotunusezuzat.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608663439dd94---31413835797.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefa10d8b6---kuman.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/68797112046.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8cb963ad---nowakuxomufitumotolive.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aeb2b946b---remup.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2pqdmqmk97vof927uuo0e2u2di/78103476316.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1dabe821---popevima.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/daxukekijafovijanod.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/91547300077.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/6538003021.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098381025e82---nezetenit.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/rebepipaja.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd7c03e6b---bupakabomajorare.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zatawekexefalosinil.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/ronatogabofikago.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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 10496 bytes
SHA-256: 095d0430757eb0116f4e5edd5f2136de03b1895ac70636b52a64bf305e208b7f
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16224 bytes
SHA-256: a0c9a15d12f6c020bad0e30b0f348a9444495ba74b41dfe695c63c33d95dd60f
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1