Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b67a350d2aedadc…

MALICIOUS

PDF

90.4 KB Created: 2021-07-23 22:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9cb1fa5fa95d72d8bd151c540463dc0d SHA-1: ee2af3b305c0a6e88db2e6a7c280afdaa18a0aa1 SHA-256: 9b67a350d2aedadc92148a86a272d93cf0f6b92149b05eebf2b259ce0a6a6280
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely for SEO manipulation or to distribute further malware. The presence of external URI links and the overall structure suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://heninrealty.com/userfiles/files/76628635984.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e6c59907f60e67f70cf22e204dcecb5c/pesesixeweligeziw.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/23596717639.pdfIn PDF document text
    • http://zxsolar.com/d/files/zazanizapasidajusam.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dle17gmikbqueelm6o0p5qnlq4/94242769108.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/razubegunipajerokufela.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/838a68810e7e931899e342dda76250cf/fujibevafodogufojiralabe.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6da9d95f4253c00411aa904f7afacb8b/71248134343.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8fb465131b43d29bd5f3f105b51a44f/1242317106.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466053f2e8---gepifojiso.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab651b5252b69590ab30e3d8fe76a248/kosedejavik.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/89571292201.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/2776406472.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c385330168b18d8870c5cf2637b3e236/83327315188.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pefuzumapoga.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/51b794a9546e332d28e9c40b89fa28e3/gagotaduregugigolimuvebu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/rixekanadowukok.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/besagizig.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/zijejovupunefutunejanope.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/zobevavakasusuje.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/37078794568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gcse+biology+revision+notes+pdf+2018PDF 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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 11492 bytes
SHA-256: 70dc2ec7060992f39a5517174081cf6fab6623b35558ff5be59390da671b655b
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 17096 bytes
SHA-256: a406664bd11332436d8307c672646e3dc01ddad8f4a2b63a81838532321ecf4d
font_02_sfnt_off00014421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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