Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e169b44454de85…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 23:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ec7a418462b77aeb3cee60c29f0f8c6 SHA-1: edd319edab496f288364006fc09e48dafa498249 SHA-256: f7e169b44454de85c5b508436f173371db9879b1885709cccf6c65ac84698016
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://peaktoppet.com/ck_imgs/files/5800665288.pdf In PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/sibidovifazepadebomiwasu.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/baribapitofimata.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/99489d03b8f5eb857ca5151619a79184/55884962976.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/63827306332.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaaf1e7ab---tazugosajalejo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/34929097368.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/ritux.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/lusudikezefegepisewovixu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ls1224aogr84jis47hms10had4/jowudilesitewoguko.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xoneroroxedizaxezutob.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a21582402---35509980411.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ea8n6e4lrtqjbbkvtniqotied4/61379938981.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/2649522712.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/25m7ft8373g8js4bv1vv0qa9bt/sitewinabiwivasedin.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sexusejojipigisukixuweral.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/kigumazafotawevotowaxana.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f6b117af4967f806c347655eebfe6647/sefajexakulodomo.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/sekov.pdfIn PDF document text
    • http://fitviewer.biz/files/file/samarafopeluwafulama.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/80419636287.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/jonopuminutivotuzo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xifogibowaridoxepekex.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/13191295400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=enzymatic+browning+of+apples+pdfPDF 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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 18984 bytes
SHA-256: 01c1a3d225ba39988565184c73f311701f6cb28cf575ad5c971ece068c40d1b8
font_01_sfnt_off000136ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 11348 bytes
SHA-256: 670185568a6b9b75ceb4aa6559cd615d19e8d5c12d9f7281d810a60d4c4f1c22
font_02_sfnt_off00015156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1