Malicious PDF — malware analysis report

Static analysis result for SHA-256 67523735dc3a89be…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 14:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 30f10ddf451ba363e22604e8f5e2e51b SHA-1: c431f87b8ba8aa6b0c041bb4874120a0fd42685d SHA-256: 67523735dc3a89be5cfe7656378ed83ec9ea0622004133c1a8f6f7b61d5b0b4d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. 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 clean score 0.1240

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ab2563c469b6cbcf017a65fd63c9059b/ganijokomalodivepawoti.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/71376984956.pdfIn PDF document text
    • https://argumentua.com/i/file/zuretukuz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a009d04e949---53312450038.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/64651349009.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qijdmaeevnjvmqpe0dutd1q95m/mujikenurowudekojizovikol.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/kasisuwigemivorikoribis.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7292dcf4cfc97cf7a357dec4abb8bbf9/jabasavejesadupexezem.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/vebesewipofeku.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ea421caf---19783022628.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8f08a6f3adf5b9c422c9e49e7c7fbf10/91673907333.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/407645ff1ff3db2cc19de69a190c532c/15372703606.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6d2dd3bfcfcb10f468b3bd5f6a4fe264/92867564219.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9ae32799---joseforurexaluji.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075431fdb3f3---tudovakobodo.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/90830485574.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/44968160618.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/heqeaueluoofbshpot9blgc3il/32272466167.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0667e81581e2ee6c73023008c9cc049d/jumaletu.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/mimutodeninalixisakosa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3ae55e28---53807532519.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882bceb4569---47056356693.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607620632b59d---luzaj.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/pibanazawezipuwurak.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/038dbd86ab3894729ea30bb4d85c3973/1882288983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+fauna+and+floraPDF link annotation
    • 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_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16920 bytes
SHA-256: 5d64373e6c477d955ef9c91f27d447fa40d373c2c009612dc00c9e60e48c5690
font_01_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 10544 bytes
SHA-256: bb383fd94cee47b7c68c91be4e8e923b45d2a7f961aab69e5b7e72dca6e04bb4

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