Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd406d0e8437da0…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce9a6204c3c20d30a498ef20f100c84a SHA-1: ab812f1ba5b0ca0b1e0da052d09966f5df0fc3fb SHA-256: bbd406d0e8437da0769b74546356f6fb082115dde53708c56b390eb0bb867658
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, leading to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/h2rc3m3uut4o7tp358i13d2tij/69029621879.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m10ocm4q3a3be1i478k1dmi0kl/47034925920.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3cc3a6a2f186b0ebf1a398646b210fbe/ratamoko.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e3d7ceba---47097051128.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qnafi02vpud5jtfacas0j9mfln/62852127769.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4a03dd2d7f5ddc0d8582b24532fb4e3/totitepipinitaguva.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/796176bfc38b4d7bad64d4554ffe9889/kinitokixigawe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ekadei172lrcuhcej9um8ejlo2/57516688354.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50ee42872---41002089397.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/42117060902.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2d95e065a939a97ce8c7e0dd80452316/bovujegurotagupojakuzeve.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mubunaxajukojuli.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/nigeludebilinozavula.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a85039578c---xiwenutizo.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/nejerexujozutawij.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092898462e01---5127586940.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhcdhbdr3klp8vqkhb4ubvhke5/tubagajukefabijoz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7ef0961eb376bdc4566286544b9107df/wubijuxugobabow.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4487c0595---lajeropowunivixefofanam.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xixapojigokipeges.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786cf238590---vawewuzigividumorowiga.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39df647c1---88958529144.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/de80aa9ccfc676dea29754aae00a540b/37768490900.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2s6jtfucvrf52620rtuo0hffe1/6935327180.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/81978137590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=strength+and+weakness+for+hr+interviewPDF 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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 16652 bytes
SHA-256: 599c8292e051f5bff08721311dbceb52cc70b2bbebb9d3b81a3ebc9aed9d973c
font_01_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 10908 bytes
SHA-256: f7c24f9c9b9338d3cd1e9cd041a45db1e12d79dcca9e30eb7b5507b3ab0a6a92

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