Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd406582a5522801…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 14:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31b2a34b4e3883cedeee51f5c07f13ce SHA-1: 511c70840424e4371e579f280cd008831790a32f SHA-256: dd406582a55228011cd12c0065106dc9840110df07f3bac21173be7c724c27b4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/bawirojumu.pdf In PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/502133814.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7ce5cc154875e17e1e8fa76eacdccaf6/wasudigupugo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be76bd0c8d---83464142059.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/92410918515.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zurajulam.pdfIn PDF document text
    • http://archbot.pl/files/file/tevuvatubow.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/37f2732c77ce81ee5e1bee81b564959a/1038068365.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/233104751.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/34607329027.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/lusitidagukisamux.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/kawebomijofefezaxekem.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xugefurewubeno.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/pijukovikig.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/32186743802.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a2d655055308ea32bd54fb64988a985/40634090681.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/95135076870.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/81c7e0b36dde8d61ca386697ceacdc3b/49461184355.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/24103249166.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27592a2c40ae5e811d954e03d305ba86/jibufufeweloleva.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/68297642160.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0nf2l62js5ctpmetsfl27q2eu3/60898831318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=usb+debugging+broken+screenPDF 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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10576 bytes
SHA-256: 28697cead27ff61a781154933303a00499b9f057af431016cc2140e0cd38865a
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 18628 bytes
SHA-256: cf95344fb37055854285101b4e26f905978648b4be76501e527f602cb73d12bb

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