Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb42f6fcdaace96a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 12:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14edc725ab513f91b6f481df98ef301f SHA-1: d47fb93e1550cc5cf71919e0eaf6c976ab932b16 SHA-256: bb42f6fcdaace96afccff54f7b2886064fc440fd580103b30485fcc6af21e53e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://badeluxe.com/userfiles/files/dusekujuritete.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5lhkv0kc3h3c34158mll5oumeq/lirugenututo.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/37792173288.pdfIn PDF document text
    • https://resicolor.com/upload/files/nepiruwilirenuxukunodel.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/10678426538.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rigon.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901202429449501acgik1l53fjt.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/bibafadalimujulewazoge.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/16963183893.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/vadatuw.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109091818494942.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/nibiligexipizunanotu.pdfIn PDF document text
    • http://full814.com/upload/files/wimipiwomagefeliwim.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2ddaf69e063f98c742e762fb60f4bf0d/dixasuwuduf.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/4175839837.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f833aa67---59010847234.pdfIn PDF document text
    • https://reha.bg/content/upload/file/61702212981.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/tugojag.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/64283019104.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/92972693033.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45097832785.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/73403939220.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2cb8217f24ee34f18609373fa5b57c63/44737844436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=le+migliori+app+navigatore+per+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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 17524 bytes
SHA-256: 8d679404edb078f9e06fcde937f325f0f7d120296c8c6b857550151300731d82
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 10592 bytes
SHA-256: 28078f80ac6be1b4d8d8f2a5b4c48162e80b99c67bfcb7339dcc70a8ae740bba