Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0e2fae8f131e57…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 18:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9eacefdcaf52d3b100ccc6c1c4fe38aa SHA-1: 2f0379cf737268e831e450230b87c78e78449769 SHA-256: 6d0e2fae8f131e57727ad375072421e8f056bb6889b333b367aca0b3ded8febf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users into downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9088

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: PDFNoValidXRef. 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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071adc28ae3d---8405837869.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf1818cef5---97689235181.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b512435d---52066413289.pdfIn PDF document text
    • https://akemi.ro/hirek/file/453793198.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/73313352356.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/67288370867.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93leri2t1ifqe8t8e20jes24s7/18234636932.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35b66f6ed---wanusiviluridavevakot.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210518170755.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/gugopusisunowuj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a08213ace---xobogidagenapaginidigu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eba8e7ec---37035254884.pdfIn PDF document text
    • http://adveotec.com/img/file/24486871042.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/10883404456.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160961db64423d---rarasefalapu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98c7b46db---7011036665.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/26485586310.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e9e3bfad---xaduxovonibiwesafijagowi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gutoxixedog.pdfIn PDF document text
    • http://ave-france.com/pics/files/60483635901.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wefamoruvikimu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1dd3e77e---53282470340.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zotilopemirufovasidabibe.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tupifuvovak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=adverse+balance+of+payment+pdfPDF 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 18344 bytes
SHA-256: faeb36edc227992165c9656afa83fca6b7a0913550b4ea26c0aa9da971521904
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10988 bytes
SHA-256: bd80d6c127c48f8fce677df431d3363bbbb04f0792d118b1c962de6082dfa8e5
font_02_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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