Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e79e69a69db655a…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 21:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc30aa89ec028cd751229315cff2cd09 SHA-1: 8278f7d190747750cc2ff820bb63f384ef72c24f SHA-256: 8e79e69a69db655afa57a92b073475d7e740eab4c4ed67c528108c0f47336e94
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0114

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://wastran.ru/uplcv?utm_term=equivalent+wt+of+chlorine PDF link annotation
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ac55dnqfhj86m881m12d5ba004/gaxepov.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d6ec3e6e---67483577152.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fagegifo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/nojogubaraxini.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/loredulebevetenupi.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/kipuminixaluk.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216a665f48---45734220180.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb360a02f---fevotiravewixeb.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fujasijuvaxusonituxebo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/59244923848.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gekogofeterulonuxel.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d090245a6af86635575312a1a5808905/67107014998.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f83476e3a---mapovivovulifufonige.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/libates.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cd68a59dcbd1bdebfd0ee5f4a99cf3f3/jixivodixamatuw.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/82094041437.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/96364bbe4cb5c0f0943af6abdc9fbaba/pugodisovafufurewelaf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/82969214672.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c329df9916f---fedusidimolerew.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ae20tp5dh9hm3tnaajgci6trdj/86431453303.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3ekvpbapoostisepait3d8f57k/liburotagi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nco6m6u3itf265un6jpp4r3t2p/57028438642.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/lajoreloma.pdfIn PDF document text
    • https://schmitz.cz/res/file/manivozakogugugufeliguru.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 18308 bytes
SHA-256: 1164c03412a048a3df8e73f8f51bfa947cd81e67cf37c86701d4df788509be78
font_03_sfnt_off00015aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAE 10648 bytes
SHA-256: 2871c9bd3bd5f41a77ad40cc48ccca13872d468463d539bf3ac5c3b0d9092100

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