Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8efe4a3f3e843d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 13:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d8dfada9fb4009998ac942593989373 SHA-1: b09d0ceda90a159e362d6dfcf2137920ea911a77 SHA-256: 9c8efe4a3f3e843d5e82cb5c1bb86cd0e2a43455fe1a669880ab11316c566cc0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, designed to redirect users to phishing sites. The primary attack pattern involves luring users to malicious URLs via embedded links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=curry+college+campus+map+pdf PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kiq2acm7uppb6jl3pktitf90b4/35158616614.pdfIn PDF document text
    • http://abc-tel.ru/data/File/tepugojelipegupemezog.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/pizepuxukojofur.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e21f2b5a3---nevezazi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2786524a---23712464957.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vodogil.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/1i7jef68ovr1s5g9eltp9c15a3/rigaxug.pdfIn PDF document text
    • http://iphysiology.ru/upload/91402939244.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gezejaze.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8db244a0004f6319ec86d7b2644a1f76/bopemep.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ca2ab86b074da69802897826c0470274/56773811649.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gefelutajuge.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/werabax.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/32235558702.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5f1732c2---merizajolu.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/30674386638.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/libipixodaxiz.pdfIn PDF document text
    • http://www.depomatrial.com/file/pujedujal.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/aa1231bafd83d3cdd5d4289ee72dfa3f/22471504122.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6c3a64422cfb36d2b989a08141625866/4613664245.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65edf2a19---65621818782.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/33ba0e1f49290a9e21c4c47aa193e6b7/16255048899.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/60664831552.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/81417386276.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_off0000b98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 15932 bytes
SHA-256: 4bc031b6848b1fea57a4319b755ddf97416567b0ed3193ff8eb104b8a99b296e
font_02_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10912 bytes
SHA-256: fb7db034a6ec858bb1e2ece9d78854b0c28d4855fc9bab176b4d227e7d0190b9

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