Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6ccd3bc9911934…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 05:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 8bbc260c5fb7bcbde96a49648916aad8 SHA-1: 247b2e8ef6ad3d0fe7ff254cbac9a39c73c8a2a3 SHA-256: 2f6ccd3bc9911934620d6314e237b436fd311ca058bd6e3dee594aeecedbfff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://foodsafebox.com/ckfinder/userfiles/files/400284749.pdf In PDF document text
    • http://partnercable.com/files/jisimufadoteles.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908055527.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/29899826447.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tozazuxofofuta.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43743017934.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/40b2e3f23b500c2e15feea9be7b864a2/wemupopax.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/88437825696.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/23127989936.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/ziwavovirux.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ubj1h8gq4oupq2j0b7dkr5c3p0/javowiwidagis.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/90412199916.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xabamalodavitosijarux.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/84468081967.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/raguvirefezulari.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/861db8ef866575eda867367dbd246043/xiwesenitixutuzad.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630837018.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901131916_3vy48y.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/81662079183.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c100bccedc---5484167735.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/pitumivozus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=harriet+tubman+reading+comprehension+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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 18352 bytes
SHA-256: 24aeebad2cc188575c075447aa8f6bead6fd56422071b354f51f4912be78c662
font_01_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 11252 bytes
SHA-256: d57876ff8fccddac991644a97c1a872e086ab53b613a14855427930fb0acd4f7
font_02_sfnt_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1