Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64b4ebb1d79e9ef…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 07:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64735037b093d5fdcf7dd17d07dfca8b SHA-1: 315aad63f98dad1b7fc53245c864625d7e750aba SHA-256: c64b4ebb1d79e9ef64e4ecbfacf00099ef63af0f5343428c37166602d41dfc54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://files.ibiza-ferien.de/file/finasebekamowolazazalunat.pdf In PDF document text
    • http://batterseataxi.com/survey/userfiles/files/61864738690.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210718_CB71D7008D503D08.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160700dead2f95---36716007836.pdfIn PDF document text
    • http://ty-int.com/files/files/44108327894.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wemunakojokawepa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086051934cf0---84824849883.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/30397180264.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6d85a962---33552267694.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/vezozi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/rarilesiver.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9fbe2a97a31b27ac056d63ddf697de29/romulofokidokotisebate.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/21040013747.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9emcqqea1cvtbpvt1jtfa7bvu/vovimadesuvanekuxasajarel.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072310541173499.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/fejige.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/01a8f58bd0d20783571915fbeaf87360/zaziguwopoguw.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/fuwowiveba.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nubowafupovujifabi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da7d21410---8503598897.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8014d14bf8---37231613764.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9acd4d7c31---bobulugolafolutoseb.pdfIn PDF document text
    • https://salwangurugram.com/files/werikani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=behringer+xenyx+1002fx+mixer+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 10936 bytes
SHA-256: 6ca504467d93e74596635aaf25c1dd77a03f0ffd6eaf53577be11f9b2d8c18fc
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 22392 bytes
SHA-256: 8a1a7fb0edb91cf314e660c4153401e09a0ec3074fc7aff98c0e67675da2f5c4
font_02_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838

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