Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfb0136f7442cde…

MALICIOUS

PDF

99.8 KB Created: 2021-08-02 11:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a8d764c031b38ebffffdea638c6cd41 SHA-1: b8f6b537c0263656319676158bbd98a77b78c957 SHA-256: 8bfb0136f7442cde98478cb8506fc88fd8d597fe1c568051ab7cea01ae873a97
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://wastran.ru/uplcv?utm_term=how+to+write+fractions+in+google+docs PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b54a7cd9---82530052187.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/2960893785.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a6acb8ba---temaguwikolexulo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/v496id2v6d40ulakhpjm6ndb71/sugepilufe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pekimagujugubad.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/pepijazuzob.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/navoduxolasobimarenil.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094409c64e25---dujegunonoromizasemevudo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/29927198496.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c69911845---kisozagovejopofel.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zoxamodomozopisebibo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/78659de8a3facbc6ffb4dc9ed723d242/talabe.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/dewaviwosoligotifaserem.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c90eaad50---91935957755.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lobemeleb.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/508d5cbbb11aca4744e0430b6dc9c6ab/gawakatoxaz.pdfIn PDF document text
    • http://sbairs.com/datas/files/99596157479.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbbc41987---pokixujoduromina.pdfIn PDF document text
    • http://rld-carbon.ru/file/8014841652.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/burodizoxudazade.pdfIn PDF document text
    • https://arerp.kr/data/file///sexelorurasulekulalaxeril.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609117762e932---28086610973.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/30057426717.pdfIn PDF document text
    • 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_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 10728 bytes
SHA-256: bd5c81d0ab4d276bf704d00ea3f446707f7b22ec61fe4bca18b37d256b81cce1
font_02_sfnt_off00014f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F69 18936 bytes
SHA-256: 3a8f7ff0ff8da06bd33857cb4372bcabd20dfee0ea2779c0d90d52366650b049

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