Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff17914d8ef50742…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 21:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d060d1386d357ff7f6af848243a19de9 SHA-1: 455b8d96beee5b37fc30ebbfd7c4f8b3f71216c5 SHA-256: ff17914d8ef5074200f5d3e98539caa20f857931ea1871dc9c3da0b4bc07b417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42f58d8fa---13550965135.pdf In PDF document text
    • http://weingut-suppan.at/files/begekuzulupunijuganika.pdfIn PDF document text
    • http://jump360.co/upload/files/20210904070254.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138eba80810b---46836872809.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4fbe48d087fed0983ea1429f74bb3c9c/welifukezapaxawureti.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/3639024842.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/60176918309.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/rapevomo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bosajuvefajigusotuluxawi.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/sovexo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/wamuruviwojavidapof.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/79920190804.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/16382660152.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nakodi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc88146f64---30230770135.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kuwex.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/fezekatepulojujezepilolom.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirenexiwowivurukolulol.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907071415304819.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/54965598603.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/60291069064.pdfIn PDF document text
    • http://csp.hu/editor_up/97747149130.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ugdfpd2p75dku5e6hoanaj26cs/13944439424.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gafulidirinixixulor.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/lujigaxerevivunepewovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+transfer+messages+from+android+to+iphonePDF 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 18188 bytes
SHA-256: 30ba033daab0cca41a43643ccc44b00eeb423ac844143cb982bc693f22794c00
font_01_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 11144 bytes
SHA-256: 1efb719e107b2fa9ac301c9eb9ee9e890c3721eedfbfc3b6e67482ca4c665588
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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