Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2afae2550fc7a3c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 09:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3f74ee1d42d5fd2763c0f4f1f358bf76 SHA-1: 81d3fc1e83c90b5665ceaa288d815a7b8780d22b SHA-256: c2afae2550fc7a3cd1ddece4bb504afdcbf56ff84cbdb2dffaa49610890404fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8476

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=biosynthesis+of+saturated+fatty+acids+pdf PDF link annotation
    • http://evohome.pl/userfiles/file/48148487504.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3177d6c44a9818f1e2590c4e1ce7bcad/12668125048.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ec9366fd9---78580011882.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79878c521b---23374706212.pdfIn PDF document text
    • http://mayjack.com/upload/files/jomesorapitij.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074f4b714---97162865140.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/zepugilagevinavikez.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/32698937285.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c5eb18f---tugezakalexanef.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/xogalelopirixaretu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7cc45801---97431066342.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/11af471119476c36d950122f69def3b4/pulipifavufet.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/napuzitew.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5b0d1455---tafidutomamutokoretulirid.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/gixevawati.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/91508716889.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gimefozawelit.pdfIn PDF document text
    • https://pepsima.biz/files/file/polunoserawosevetimum.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/zelubivujezevuze.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/59106196538.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7a3d72dd---motirej.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb1d69057---rizakinukemamezuvigexu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d61c347406dac1876e285161293f379b/ruzepolowizom.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb985376b5---tabadenibuwopusasikuwo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pueauve1ub6to357flkn3ljaq4/pixivusovebe.pdfIn 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_off0000c095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC095 15808 bytes
SHA-256: 9a6a112653cd18299df1b7654ca87bfa175c69b4d797a18d89cf17cc64c51ac6
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10940 bytes
SHA-256: 37535d0f9ae667d0cc12aabd29e5082fc0c5f8b5dfeb9b936cff30adb1ff4dca
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1