Malicious PDF — malware analysis report

Static analysis result for SHA-256 b529b9f7f7d3e5c6…

MALICIOUS

PDF

94.3 KB Created: 2021-07-21 07:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6adfbad7bbc367b0f318e6c40382a67a SHA-1: ee5ae6fb978aaebc52f0044ceb8963a01aac9fef SHA-256: b529b9f7f7d3e5c64feb7b3de3d05c40cccbb88fd3d74a3ab25ce0e4e1ea4edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosting further PDF files. The primary attack pattern involves luring users to these compromised sites, likely to deliver a second-stage payload or conduct phishing. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs on compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://japan-railpass.info/images/blog//file/69272365088.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe8fbc4a1c---12876274352.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/82397686891.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975b89cec3f---kolomonuxowuzarinefax.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210622_212510.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kenuwofesekofoputimuxela.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/74405843514.pdfIn PDF document text
    • http://chipgene.com/image/files/20210713_172834.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc8126b88---22142293172.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/98892683622.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ictuemse1v1h52pp1mb4amf2fg/piden.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3rqmbftg74k5js4b8srv21tivo/18128733507.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78f44406a89333a7197930d551164a40/mugufakezupuzilokejap.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/57231540529.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/pajilatanigekedilem.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/17787235244.pdfIn PDF document text
    • http://614move.com/clients/4890/File/ripewelelatejilezo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ae03934b4d92cced619e32472482c741/12513165194.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab879353dac---69729450547.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/82059261204.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf9b6e0e3---83844387509.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c2f126d5---19026451198.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d976935b4---53823424332.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tirofuginelepaparuk.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c7053e7e---86961601317.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/nojaxilakuwogig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yogic+diet+all+you+need+to+know+about+food+pdf+downloadPDF 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_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 17964 bytes
SHA-256: 5590041125fed8d50dcdf5e12d40c8980a0e0b4c7b24a1b24692e1790e2efd9b
font_01_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 11044 bytes
SHA-256: 727e30c181bc7e5d05e87f8bda5916f3dedeaedca1fc812dde59394a262fa9ad
font_02_sfnt_off0001536f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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