Malicious PDF — malware analysis report

Static analysis result for SHA-256 fece2a4fa2084f63…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 16:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 686bd685de6d6a96a95583fa7a2013e3 SHA-1: 5ecdbfa57f98ca03ae5a4ae8238d02f695be5525 SHA-256: fece2a4fa2084f632f448ad7b47cc093d2a5f48cb18aee4a7a074766a64ec78c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=minecraft+block+hacks PDF link annotation
    • http://stmrcstvm.com/userfiles/file/dowirinapivekekujonif.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc4642177---navutedegadejejokos.pdfIn PDF document text
    • https://majubesar.net/contents/files/86383964333.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/95883983881.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/31651554646.pdfIn PDF document text
    • http://hotechike.com/files/files/76294467730.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/borukiduketejexu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rigoloja.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/19010792936.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jukafebuj.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nevabired.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/dabalolid.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f083d1c52e---sizovaboroxitanazera.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jojoxaliweju.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109110204312422523b3tr3nozda6.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/23895386906.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/dusezurevupajapa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5e4e99f56dc822b8ecb85a7d6f37fe6a/vufajevakomivibimeki.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccfb6d9bb---99337047142.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49399c744---nevika.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8e0285d1---novawajodelepotojipaxijug.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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 10656 bytes
SHA-256: b3da684ae8aa03a1717ceee5f1748b8b2799a25998989874d9a44e93cfe0b5ce
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 17072 bytes
SHA-256: 7f7addb6516b94d43cb1ab09642f0cbccd1e89ab7ee355733729ca53c5f6d025
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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