Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4c9784772fc50d…

MALICIOUS

PDF

93.8 KB Created: 2021-08-03 17:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0d8256e1d94d6e102bd0893864bf25d SHA-1: 8701b3fef29e3717a7592a1211c60b411b036a01 SHA-256: fb4c9784772fc50d717a6b83b4a340a31b245f2ce18b8499998fc6c7be77db1b
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. The heuristics indicate it is a link farm designed to redirect users to potentially compromised websites, with a specific lure related to payment or bank account changes. The presence of multiple external URIs and link farms suggests an attempt to host malicious content or phishing pages on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://inwebjor.ru/uplcv?utm_term=can+i+open+up+a+capitec+account+online PDF link annotation
    • http://arebiatours.com/uploads/files/23390780171.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210729224616339205fwat0.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078671110b3f---48409270317.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9usedhf8ri3fejmg16m33pkbtj/nexine.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7511e4db4fabf69721a6b63ff97eabe6/77637836619.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/97839586057.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c41408f8---sewavuv.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/kizewudajukuw.pdfIn PDF document text
    • https://eventaipei.com/upload/files/pikininobugurale.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2053819478880bcbe33082d261bcee6b/87130333620.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/54924025610.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/14020113881.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607912706fc7b---9945876251.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f1c7d3a4---30311880276.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/857887bdebcb420943acfd918bf74578/98988781369.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/72150a8e8d2cf3d9abbda5685f1a61d9/75966131764.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/sk6o9ulij4q6f1rl2najpb2ugf/93105747231.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff0f8ea769---9675235548.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/233702976.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/vukevolupexefurafosogel.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/gujejomuwuwotab.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d673b8a1e---39765485163.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/75426258368.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/38841916563.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_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 17036 bytes
SHA-256: ca9d899e92722447b81c201055a1dca6869393ebac9e75174645333b340f5548
font_01_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 10228 bytes
SHA-256: 5bb88e2a62972c97b58ed209332f87ff340530d63237a8c8cff1a7c3da5abb27
font_02_sfnt_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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