Malicious PDF — malware analysis report

Static analysis result for SHA-256 782d4b21715a9e1a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 04:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6c9590e6d8e12fe155531013ed6e128 SHA-1: 29e741fc11feee4a68796e8522ecc6b7fb307ad7 SHA-256: 782d4b21715a9e1a8097e1fe26811984d3d0ff391f0540a8dc1bc0149b460fec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4649

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://zamokugrofa.sk/admin/fckeditor/file/xababu.pdf In PDF document text
    • http://amdind.com/userfiles/file/fivaxexijepipafiwes.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/safezuvavudawazasava.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/27bdef315819fd8974011a3bfa88d3e1/83240722520.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6106bcd76c---pixezelom.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/90404914249.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/zemuporeliweleku.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/99071175590.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/wunefinekure.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/pukivilediperososiren.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/28f6c634be9cac25a91518803eb69998/lapusitozokejonipunufu.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/94256232167.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4be75be8946838fd46d24d2973fa4e9/52784327912.pdfIn PDF document text
    • https://eniedu.com/data/file/20210807092809.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/lonaxiwe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45442a61a2---70960053298.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/ritatarekukosovivu.pdfIn PDF document text
    • http://goref.ru/files/file/90982636405.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b49b62dacd8752e6c7233598eb1548b8/63844463183.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/15568263979.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/voponamezoberonisavi.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/69846332738.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/xoruneroxonobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=biograf%C3%ADa+de+edgar+morin+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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 10644 bytes
SHA-256: df1b4a0f8da872f4af14e94780211cee00e41fbce581936eff4ed694f44d4d37
font_02_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 18340 bytes
SHA-256: 6a7e1594cc7f6ec3aa5fdc67fd6e88638880942b85397ec0877cf04209c51ac9