Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d09dff7e5f177c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-04 04:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11fa722f2e9f29b7534e72806fdf654a SHA-1: cf03aa11cb4b67df0d9b0c4497d93ac055eebe84 SHA-256: 19d09dff7e5f177c8b617a1885d10cd25b47e997645b099ec28e3d6b351d7742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://airbaankhubon.com/userfiles/file/81129013266.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nd1lthloec7gr80cd50g59dhb1/negorobokovewizasuzo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091b70e0855d---74030184619.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607259a9169de---5920199090.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/da9b9fe37d8195abfe6582421d4273bf/wejodovigufimiwel.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0f9ca79f77e7690486d6fe5b7ec5f662/38126330869.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/17147b42045199586e1a0a11f9d75c1b/zopizaburegil.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/notudolutopo.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/riraj.pdfIn PDF document text
    • https://kopari.hu/files/file/gefipalegutelefoto.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/82037830361.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075133fc6f18---gapalip.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0bb7b9idhppohlgdrfgk6is5f3/nevuzuvudoxiwijisuvex.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/narumasepugufugu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/55909777247.pdfIn PDF document text
    • http://ipublicity.cz/data/file/49341699488.pdfIn PDF document text
    • http://elm3rad.comfile/degidumafatunuxavot.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/toxoxadisezodozefof.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/zuwidigukipazi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/45af0393dd41e66b2710c7979e771b07/fajonanodigutawab.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/51f56f4e93a86c052037c6c19759e25b/xevurolamalejixisigiv.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160903c8a87708---90577044817.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8nqnjr8bu8jpd0sie5f72brni1/fuzogale.pdfIn PDF document text
    • http://hanleyresources.com/images/seridin.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/51e5cda60e8c7911dd4b54bea9849a20/70028598702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+aid+procedures+in+the+workplace+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4a5c1973cf7c3ad2d58ee1b3c7855323/69837890554.pdfIn PDF document text
    • 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_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 15704 bytes
SHA-256: 465d2dda4803cdb135795911767267688b37993020382ada639159b736d32c3a
font_01_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10972 bytes
SHA-256: f35794457aee25bcd048f2a2d4a9ef483434a1cab1a2561b9e5ab8a8a5073535
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1