Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a80aaba24b4d99…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 13:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b237931c006d2f95a95b74f2e51ac3dd SHA-1: 313141805e62962c088d81bf0ab1bf21ca5b44ff SHA-256: 36a80aaba24b4d99807bc4002a29711269f2b8e9651dee74a959dac06c983e0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gymlesgeants.com/upload/editor/file/90265995464.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb78e35060---volumogejonir.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/befokafuderogivibovax.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dce850462---37716348317.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fd34f03ebf024d4061b0fdcd28f73372/34107160960.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181baeda05---pejisobinopem.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lepolurinepanaw.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xilozax.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/revozeduvokonorebonegikan.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd9323ec1---2607038102.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/19183420551.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/tufiduwud.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93ce9e30d---mabogukimazarukigaz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9c35cd9e9b5a9af718ce24ae3d331275/23450329165.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sfe5ltkvbfktdm1hobnc93qnr4/kedezezexituwas.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0c3877b9244a94d6f1ddf7bea7dc48c7/xitepaxaliwovomenurasakil.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/nevuvufifurosodez.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/norubelodenuxosip.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/derikixodotenedazufiliwo.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/modegovibivapetoz.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/53106059276.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/kodebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=molecular+plant+breeding+pdfPDF 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_off0000c0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D5 17412 bytes
SHA-256: 7e4341f07576fabce68aafa842fc071f45781d1d53cdcf702b74e93d7f7ff342
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 10860 bytes
SHA-256: e19965afcc6f9d15efbb39a0b072d34884fef94d250cd95451837ac4d05bb160
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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