Malicious PDF — malware analysis report

Static analysis result for SHA-256 314c42642d66ff47…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 01:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6447f900bfaa8a0697de9c2c87940fb8 SHA-1: b3b6a333ec33c84b86424452ece7dd3cbedf649e SHA-256: 314c42642d66ff47ca43dea759c89b789b0c034c1177152cbe2511ad587a52b9
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://technocom.pl/editor/file/wixulowevipikutaku.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/72dbbcf42c663f5e20ef2ac7c82d5d7f/lelotugokijumut.pdf
    • https://xanbiente.de/userfiles/file/gerodemamafusaze.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f032a9eaa---35863281976.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1031ffb210eb0271d60f749923cf7fb9/bomanileronimu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608352a033e88---vovukonimeteno.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg637uvmbd4vh7l6eocfpihep5/21448664383.pdf
    • http://phongkhamducphuc.net/images/files/nipirazikipa.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160999c7b8bf65---wapomuratejati.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83d971cf2---87696611899.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/96577874159.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a81ced4bd5d---wedodavisidowisakugumeja.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7kr8sja26uj1511b8nema96ibf/31323508877.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b1ecbf28---lotakugida.pdf
    • http://mientrungpetrohotel.com/users/files/xufinuxatukusulapisefulev.pdf
    • http://stark-tools.ru/images/uploaded/73642453096.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/796b6efd501515f38466e5db78f97834/81771566281.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/457211f1a55eabb6ea8a6d999043aa82/6034211215.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+solve+two+equations+with+3+variables
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5c.bin
31d1a02c675208655f65d173bfbea2e8058adb0432b1656776cdde813b251c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 17464 bytes
font_01_sfnt_off00010c51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
font_02_sfnt_off00012468.bin
3a22a3c8b16756ec410977cfc5078dc801ffc171c61cdcca9a4942ccfc9c048e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 10904 bytes