Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f8fc8240bbbc62…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 13:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c9b1da54d39c784e10e6b19e334deeb SHA-1: 8b3b5651c0893603725bb37c029195c2e0347a89 SHA-256: 00f8fc8240bbbc6208e0be352da3ba91a1c9c3e208e535eb64fff735a20dd4d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ketchas.ru/uplcv?utm_term=mp3+scars+to+your+beautiful PDF link annotation
    • https://fibaquitaine.fr/cebatrama/userfiles/files/venopuratotanadiz.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160741713655b1---bopepudasisobimezawo.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210524035103.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mfpc2t7aeil6uie5undn096kkq/wurumezugeduxaxe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9b885f594fc35b48d1204f25163d82d3/pudajat.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/zasurumuzuvelusita.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/21017739258.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d8836371f680249438662465905f1cbb/nimidizipekekutiwegule.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/jv4febd4i6re8ukd731m247o06/fasugi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/rasiw.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a027d96d2dd---10785186552.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7a3dfff---64448143190.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee908e484---42670122123.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a4c97f96---vawikutubizi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/3833850198.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa49db8f7---6985097664.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o13dghfbf0m5f0ov13iaq31gc1/91688961723.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160818bd5631bb---pakamu.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/powema.pdfIn PDF document text
    • https://promise-land.com/upload/file/60811532941.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53419489779.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xenugirixemibaralulonov.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2744bf10f---puwexuxojokuwedolewisekif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 19052 bytes
SHA-256: 953d0f23490b67fc14510bdca12418f2b8e359a4ad19323b59348b038b9f8f0f
font_03_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 10888 bytes
SHA-256: b39eb08ad143a829862fdce28dd8139f87df1f15f54292233e8b55214f86ca68

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