Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef88a3e727789c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 12:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f734b3f6804a22a202cdf394440cbe5 SHA-1: c077c8b9d746011b43a75fcdc02860f4db816c31 SHA-256: 88ef88a3e727789c5d39dec1f474f9d8361305cd9384c80da5e0c26b3ff960ec
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 high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern suggests the document is used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://location-appartement-venise.com/italie_documents/files/nexesubuvarutabodew.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kojuruzobonaxowoke.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021061601383566.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9140e93cb---pivafuluduwekexo.pdfIn PDF document text
    • http://cartopack.com/Images/file/95501009491.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gifagagoloki.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/385a740c47277d10f0d54433dcab7bc1/guvevavefagejubudosewi.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/mijojapukovo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9749be77b---11626909224.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc7j5oqorqj8v1tcg2k5volvb7/71866469254.pdfIn PDF document text
    • http://leton.pl/userfiles/file/83872571836.pdfIn PDF document text
    • https://dafelia.com/files/sumitoliguberaritifitipir.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/limobel.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2fe5eee69af94ba9c20ff9b687ba1fbc/gobiniwatepovikexuw.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/38362928687.pdfIn PDF document text
    • http://video-cycling.de/files/file/53915398979.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/jatuwinujirazagazoz.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tinaja.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zinazudinuxup.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/af7c82608dc53ae1bba916a33ad8756b/zadopivatodiluzefobofeje.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e8f637258cbc42e00ba56efd62a7ec1/72482970445.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7762b82510bef2aed2784b68fcccf540/53003869671.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c5b7393d813e52e17f5733b3029c7a3b/zotezafixotogew.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/63310732591.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/gaidk5v7jfer8p74ohk0i2c96i/25857885015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=picolinato+de+cromo+pdf+via+farmaPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 10680 bytes
SHA-256: a0c94472677b3e21ea47163a750911502513714f73bfc3bd001d6415955a113e
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 20184 bytes
SHA-256: 592e4c1fee8397673e8c0dbd381c80b7bc17a3f0d0363028ec9d7226fb4201b8
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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