Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3e27097eaec08a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 16:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d26ae7bad4c12cac65b958c262585358 SHA-1: fb091ac40e1ef43bc1dc1c96f1ba15b9d9efc2bf SHA-256: 6a3e27097eaec08a59bec62af3724146a5e715c7bd43aa9ea29ac37ec2f56f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous unknown URLs strongly supports the link farm attack pattern.

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 https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a41b5dcff8---dunotew.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/021a5c3147e8cad92b196201e055cae7/sikoxavufavaborix.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ac1c9186178f57a2754c921aa10fbc3a/fagisefodi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e6a676da---5874741966.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/61063209561.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/04494c1cfed07952a06056631e56ad1a/wolagituki.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/lefagilujo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b58b50240c8381e25f79440acf809f28/vejepuvix.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kexafosowujivuwirebigut.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/64297840491.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/puvibupakaruralazuko.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989472234b5---podelunavozox.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6133c45236---vorum.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d80130a95---tuvokafojoroxafufirusi.pdfIn PDF document text
    • https://t2sc.me/userfiles/mesopetabimoruj.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/72afb8f3ef8a28e297d75e8c51722c91/70844464565.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/30689395149.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kajizotodikinegawi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/517979faec3c4bff5f81ebd863a73843/76121060891.pdfIn PDF document text
    • http://change4best.ru/upload/file/jejefubuwerudewatudu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079753dc3914---28487309205.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbb0e8e77---gebemosupafa.pdfIn PDF document text
    • https://togeltop.net/contents//files/farepoloberedefos.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/wifopaborekimivunumuri.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/kilomevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tony+romo+and+chace+crawfordPDF 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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 18252 bytes
SHA-256: 6b37ad55922fd49724babd3c7763710a0733864ae8ced8d2bca0369ceae2a9da
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10500 bytes
SHA-256: 298fecf80cf05febb0074bbbe63cffc5daa5f190ef0c35acf18db8f523131a9d

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