Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e60b2c84bc7e57…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 21:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c49077b0c063f51d6e62449fb06bfbb5 SHA-1: c64484c753b772dd42f194ffe3877e416323664b SHA-256: 29e60b2c84bc7e5787ce3c8e46e01de44fe13b33d34fb770d7ac3c8241942648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vhssirimpanam.org/ckfinder/userfiles/files/54249078393.pdf In PDF document text
    • http://e68momo.com/shopadmin/upload/files/47605919697.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/bifojegizurujaguvupenezi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bezuberakaraditimon.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diketa.pdfIn PDF document text
    • https://businesslife.com/content/file/35548913621.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/23818551048.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/padabisudok.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nuwelolilakexusefowolok.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/roxigunedaw.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/23163027143.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/24055375068.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/nitefarav.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109070302246755.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909030935.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/kazuvek.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/67d8a58a35307415308fa86433aad192/923714387.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/29445867449.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130335238af7---dogujoma.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/58908552569.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tetabiriri.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/botomor.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134735838596---fipopavibakusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hd+backgrounds+for+androidPDF 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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10700 bytes
SHA-256: 4c9b84fd6f4d0bc1db2d7d51ef61f4c469fa7a7021deccd2bc02fe6bc37552fa
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 18536 bytes
SHA-256: 61f784d6ab88852277b8001a6acd59e17f514d70b51bb395d497d7e7c970f10a