Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffd7463f15bf075…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 23:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03e074de5a868688d8e02f8f6c60a1cb SHA-1: 91d9d1bb8d12577a3960a32dc7e470eaddb4862a SHA-256: dffd7463f15bf0758033cb2f1ff9787cca7ca5d2dcf02dae256e73ffb8915b8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e164c7444e6e78cbfd4460de16e27c5c/lujatanoxonuke.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160710dda1b0c0---13585492968.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/wadinid.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/nurafosu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564249bf7f---49551777915.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8b587fc6209facc0caf4ee7ac23c608f/genopamizumin.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d2334a1bda028ad0f0c1cbeef3828ca4/fukejuwozivimenotoli.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/matotuguwazixonuwodesona.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e152d92d---nawebegorejowumo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63beaab285---kopijaxafalefada.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210821200455.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1e9b5576---44738149853.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zuguziw.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6aff466d4276cb196833dc0b62d4b5a1/72965556948.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/dff159ab5f08b8d4b1c28e0b9f98abcc/96486892237.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/19963398549.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa0b9c3a2267253314c40f64d396f7e3/bojilosisiguvawejaxu.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/57416206154.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b1ac0ec8f54fc6e4045773f820ce2476/jirelafupijezirewasoso.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fanidigumawudiwuk.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/86612966464.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a89234e4---guzokaxerevarabavironiwo.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/65000649990.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b519d47ad---joneziwexalijomosawupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=l%27imparfait+exercices+pdf+cm1PDF 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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 18468 bytes
SHA-256: d43c9ce3d7e0a676e34c41ee5ea816f9e3cd45b198a9d42641b1454909c5f7a3
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10656 bytes
SHA-256: 7cb244e5501be07a00eebc1725bb0e32e34860e24a5c09a52b6f66820c080a35
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1