Malicious PDF — malware analysis report

Static analysis result for SHA-256 b020bc0b43cfb027…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 01:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efa0c8058c6ee299ab43d8041fe904e0 SHA-1: 43b3138a2deae4e46ec0d70f013ee7f37f327890 SHA-256: b020bc0b43cfb027acba790f7b136e689b425ff6b6fe9670f2e191f0d05faba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://implant-drill.com/userfiles/file/serebuvumowelavebeti.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/tasadojapoturas.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/katasaburawumabafitiba.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62d1642a1---44750337884.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac0d01715---7233894460.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/70eb7c8f22452a8b91c2d2aa4e1ff069/mimosokowebexe.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d42b45049a34c51d8da3edfd3212c85d/mirubepurezijozujeruxo.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/13863292039.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/edshvvfd0sdc2h4celj6b1j31t/13155834607.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/7337237028.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/79775919258.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/eec822a15776dce46e9ddf0ce55b10ae/fozakixode.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2b01bc7e---75567806151.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/detudel.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v4umvtf4gum0bn93a56orv93p4/99331219771.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/eb47a6c2ed14dbe029fa6adaebf418ed/65543045130.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/tnpksrh9r6ul5g35e9q0mdv894/lakatax.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/fanenosixosezapopuninasu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/negixubudewubavax.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68029716561.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/rizukibowababuzufutuk.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/nepulotowelezafuze.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/860bcf90131587a4776a41d18ccd9801/vowugalifizaj.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f1d348b9a29a9682350ca1cc32213c37/zejikowuje.pdfIn PDF document text
    • https://ghnservizi.com/file/87080134653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dungeon+masters+guide+5e+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_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11032 bytes
SHA-256: dd557a67c0f9f757c0ad6ec89fe070f7408fbc59152bc604e1894d1dfbfcbe1b
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 19300 bytes
SHA-256: 60eb63f835596558d434eaa9e87014a982938ef6a32d81329e040e0330e2d011
font_02_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.