Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3508d6512410ab…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 22:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 486678837a2ecc8df4d9c54bfc96bb81 SHA-1: 44c066eeae8037896915782e01fb4ebb8009149e SHA-256: 1a3508d6512410abf46a8675e51bdc62c62c6c492b52a3efbd5c2ee585357d92
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious files. The document also contains a visual download button lure, reinforcing the phishing and download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://cv-vezouze.fr/media/file/jomesabekabazi.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8b45c14fe0727ad28a8056e333607011/12686870934.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/85209853943.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5d8c451de74fe17997ccb76503364daf/22711243246.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366f7fe696c---kivedu.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/mamuliwoparugano.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16306203911791936772.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/98317281527.pdfIn PDF document text
    • http://africareview.in/userfiles/file/33713966706.pdfIn PDF document text
    • http://esipro.be/userfiles/file/werepetode.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/46949252731.pdfIn PDF document text
    • https://beautydent.hu/editor_up/42934594907.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xefemaragelojalefadadiso.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/tosegeneruloli.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o6dvu3501jg3ctfahk7331mdr7/32453820132.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55223273924.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e44635aaa---xatuvibenewapekikumogapi.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/32232690353.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/balevazetibiluwubazotodon.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/51770613765.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/disurunurenejumakegotozud.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50161015203.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/43953301818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=turn+the+ship+around+pdf+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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10744 bytes
SHA-256: 245633c18525a356ef20c3797409a35c534359a26787742e6dd329262342e5ad
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 19000 bytes
SHA-256: c69378ece9f0910573036117bf86ec69be1f94c00f2aaf83cd90b649cc478bf1