Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8b01838de90b9f…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 17:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 931752f658055c5a026fd57911c18c12 SHA-1: a44be2131f8066fa638614e6b36c8b3425da6d5c SHA-256: 5d8b01838de90b9f410957adb0d54ae20a2483270e95cfc00a43548d644bc67a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring the user to click on these links, which are part of a larger infrastructure for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ubest.ru/images/file/zosupozupelilu.pdf In PDF document text
    • https://area5srl.it/file/konapemiribilelunugo.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/68819558159.pdfIn PDF document text
    • http://htwy.com/upload/file/toliribekorudutub.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/95c8ee00eba5c4b2a3bdf5ad2594a79c/zusoxaxuka.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • http://effektfilm.de/files/file/6330373592.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/77001019258.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/kakiwub.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jufanudefuvenolejibexe.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa66eb7164---jutowudorigabewafijixij.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/62064519036.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cd1d0a82d0be8c90c6916e1d7a6fa356/ragutagilolesokopigozav.pdfIn PDF document text
    • http://stevis.cz/files/file/vifewosovujob.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085759b4755b---14060038998.pdfIn PDF document text
    • https://funbugs.ie/files/file/60765363353.pdfIn PDF document text
    • http://wdnederland.nl/file/sudafigiwuxadu.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zogazatem.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/vamizaralogeb.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/xupizupedagaje.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc4da8d75---bagurewutosijubuvum.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3ev40mhnvh32ukhcanahpqpfrj/90843901800.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/92622801132.pdfIn PDF document text
    • http://cssh.es/img/file/kokopovonarisamojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apc+ups+2200xl+manualPDF 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_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 19424 bytes
SHA-256: 087fe810bbe139df8b2181f2ec0ef84b2a2652cd88bad50d0ea2f8024fbc9d0d
font_02_sfnt_off000164fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FD 10420 bytes
SHA-256: ddef9c4f829f845c01a33b09a82db689dba3c8ad0af55c4aa34a311ded704ee1

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