Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5a4c0af602c200…

MALICIOUS

PDF

86.8 KB Created: 2021-08-11 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b308fc5f6138fadcbd56aa91d8d2a655 SHA-1: a3dcb5a120486900d2e02c9b53a4d57965dec890 SHA-256: 6e5a4c0af602c2002b7f27497812c7756dbef6b9c3daef7cdc4e9420b592fa7d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dc97cad4d1d189c6e134e4a45d5a5940/76739659653.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd79e12bfb---togakiguwuvosevetonu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf93cf3db9---50165653401.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/3234132762.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/93336861919.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4282d83133d2176c70af50034b01907c/10562037634.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c24eedc8e---27646725384.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/268543c7a5b8e2e04ca5c64f198078c6/71905165744.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/33606318439.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/boxidivikojodukuremusavu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/13837339230.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afb25d4e904ad5d7dd82366a9599b6c/6910452721.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4c26e37b23f362b4de262a7506fff776/39710761486.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/310a81d139c093f67b5f3636a6d601d4/560446392.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160da3d8e90a5f---58634556223.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4e16f64---peven.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a53516e---bokoxubasav.pdfIn PDF document text
    • http://ropesadventure.com/d/files/56431097092.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/refejizijivorataruz.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bukukakefepij.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea760837c---labepop.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/vofenufijovinegewamowet.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/20176392114.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609458d98dd8f---60366985056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=curren%24y+weekend+at+burnies+zipPDF 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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 11048 bytes
SHA-256: bf4b25d3f0b6653725fd05f6e0e00ba44fb3db6b25e8b29c9835dd6533f3e461
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 17856 bytes
SHA-256: cac0af8d8522d01e932df1f1725c811b8568554f2c05fc9f9b7c2d9d04914c14

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