Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c421d55c463683…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 16:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cda74f4e040db267bd1e73e88bcff466 SHA-1: b823c3cda6cfe60585ab272594000253eac576ac SHA-256: 69c421d55c463683a1c26e98de699a3eebd064ae39c47b4f47ef8d3485ec162d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, including WordPress uploads, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wineart.online/userfiles/file/sawidubaluku.pdf In PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/8362869724.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/48195999470.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mupujekajuvalimuk.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/lotuxesiz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wejaxenusazaxan.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/86691187925.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/mapigopofixosagu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/55ef6051256705031cb171c3e5de2192/rasikopizugaz.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/tizafevibumojujikuwi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bagotuwibemobirurewogimut.pdfIn PDF document text
    • https://foulardfotografando.it/file/pasifubidaredovagisa.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/49442791620.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d823833339---murepiduw.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/auu05op3vch3j35mtv56fh1gkk/90716302268.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16125ab070b055---14049612815.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/lazinatirutezewowojutegin.pdfIn PDF document text
    • https://unosms.us/userfiles/file/97257427801.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777b164313c---43812442156.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/34696526840.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/8359905011.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/ziwafakojinofenonug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mycobacterium+tuberculosis+fisiopatologia+pdfPDF 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_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 11208 bytes
SHA-256: aec6d5cdaaa5801db05932f3ce05c0742308f599c36bd4a55a4648bc5e21e3b3
font_01_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 14740 bytes
SHA-256: 04141603bea0ab03c7d9edc9334e4990d3a3dff0e099ae7a02a95dea02e3c8f3

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