Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc000ce3de9a6bbc…

MALICIOUS

PDF

93.0 KB Created: 2021-08-13 13:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97a437792599bea02fbcb59a8781746a SHA-1: 4217d1a7d09134d3b9aa491f291b606af7b0862c SHA-256: dc000ce3de9a6bbcba57106a71aca725082868a82165c30353963749be9fed26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage external resources for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aadhaarretail.com/administrator/imagetemp/file/rozibupudesa.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a847baa032e---65514049884.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/70182819842.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7817d18b---62202613281.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cfd3fcfde12c79b3e56c3e79cfc583b0/39453701302.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4445e44ed---xonojewepixofulemi.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vigudabodutirejago.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/latofegudinagi.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/41371353838.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/16272644371.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4adade969---fujevuvilosijigezipimiwof.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24e262e7e7579883c65eb40c80e258f1/kolegunejunusetavudezazi.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/kewuwebup.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80ceb0f388---83429586278.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e60c2dd5d33f32bb53c059a2173e6832/15967350518.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/95360106023.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/82722157963.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c5978ba0b88.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb29c5e06c---kojifa.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/g540egv9dperfqi04tj9t16ruh/8681773994.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d0b6fd083ae5aa6b704f52e1b73d2706/guvewajebu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jezereniraboxusapi.pdfIn PDF document text
    • http://toonesk.com/upload/soxemew.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210807/files/20210807115233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+care+for+a+female+dog+after+spayingPDF 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_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 11156 bytes
SHA-256: 542b7cee72ef9b63c0278c8919c50f8c0b71f58e5e9f7106c5d2e6c2004240bc
font_01_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 17336 bytes
SHA-256: a3a46ddc93236b0d63c9c788dafbc6a937d983786b4bd279228704f4c4d02ca8