Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4530ad6c065a5b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 21:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7706bd43c2da6b3b79a21ad7c931b472 SHA-1: 24ef6a0b409ce69b9d59988cfb05bad46d3824a5 SHA-256: df4530ad6c065a5b1b6ba4246cf3d431fcfb37f6c4d251cc5cedf88ea8711daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious distribution or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://ketchas.ru/uplcv?utm_term=gilson+pipetman+repair+manual PDF link annotation
    • http://box8websites.com/ckfinder/userfiles/files/22977641182.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pusagafejazuwemaniwive.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf44d22392---14235199078.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/fuvemuwuw.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630772055866.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/21396521414.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/1927017137.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/21568892915.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/57410659675.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gagimafisa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bbe40aec71da8cc8088daaa7daf1d44b/mijunodaxojoriwij.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3753f795---ladaxamifagogonutojiziri.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/39678225741.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/29b7c76178230ed570479a4a3ddbaa77/83004069878.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/42095542175.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/dowom.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/40511956358.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d5b267527fe38330e36f81e4ca50bbf6/21146779716.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021629221879055.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1d83be4c8590a2f4050ae5f4f32f69ec/volaledinadokukupire.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/57272334223.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/sajozid.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/zifosakobasokajera.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/13834118400.pdfIn PDF document text
    • http://w-mill.jp/images/file/sixup.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/badodekopafarofut.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/41761894829.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/barizuso.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10552 bytes
SHA-256: 4c05351bac78fefb2c9350e3212f96b9ccbd081e1488900ad9abaa5aa0aa0223
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 17364 bytes
SHA-256: 12df902fbae1977da836b3cb5658e736bd97ed435a06aa4dbb86905379cb8a97

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