Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcdd7760f2839e6…

MALICIOUS

PDF

93.9 KB Created: 2021-08-17 00:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4c53e335532dd5141e04b578d1e792a SHA-1: c0ebf76b37c9c66e5c46006aa8857730375de20f SHA-256: 0fcdd7760f2839e6ffc282efdba29ad71a9e7e2dbe92fc58697d60fec516a3f1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially boost search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5f13d08f9ce8ae2bd43080156f86568c/damamotivegewowuvekaz.pdf In PDF document text
    • https://huaku3c.tw/uploads//files/202108031242106337.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0752c9b399---xekavu.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/fuxupokodavi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2de5841fba6f34fa607794feae4fc28b/9810386014.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/18637747513.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1b10901dd5d07d3e6b10e6c15062f66c/sinejegema.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748048901bb---jadojoreruwoni.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/96964826585.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d2afe3cc3---89546454262.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a548101d---99898990231.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926fe5c9b33---fujokawukitisukekuj.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210714_0EB1A2737ED5934A.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/jojuga.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f1c5512d---16719735490.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/komazogamobowodazokud.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kejob.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/14704571277.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/g2j7ks9dpfuk43ns290b4kmag7/32516118154.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zijuxuxowuvikafaremiror.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nuwazovalizerogidubukudim.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd460e18637---17903276832.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/98962664219.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/72169f375065ebc01fc5e2f7826049f8/13377880139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=roblox+ipo+date+redditPDF 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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 19832 bytes
SHA-256: 8ca146d114e9dd01dac026d454dfcec64664fa4ec13875a9ab593574663c5994
font_02_sfnt_off000151ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AD 10400 bytes
SHA-256: 99a54302e773506b1017cce264ea8ae6e8facaa3e2e42c5b4fa0158441900721