Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fdf1f21ee5b123…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 13:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 688d585d57bb283e319d973a65fec045 SHA-1: c974e0fc85e5538272d7a0f6118f45fe23ccb629 SHA-256: 70fdf1f21ee5b123f93f2dda65abe5a773735ced9f2df123a089a0dbe5c0b68e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of external URI heuristics and the compromised CMS upload link heuristic further support the conclusion that this document is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=simple+rental+agreement+form+pdf PDF link annotation
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b3a8637c---sasaguwebibizolo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/39479032563.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/2404067500.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c778f430edd---jonumiwajekusa.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kuludopazuxitemuved.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/53a1d2408dac9e80c583cdc1e3b7a16d/59431068256.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/durelukikijolitosem.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/24830865236.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9tgr857khuh13i32936l7a1jp3/91248956405.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608508780a15d---1008146191.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/71761610150.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/dopufazused.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec39fb0bd7---60046622474.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/66227704230.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/810bebf75c79c803c9036434d02163d4/xojoruxenutabenaj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9db75b3tpanq1qu03cuivgsim6/75107741306.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e238731df9a---67294509587.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741c5194---sibisebuzusobuzimegaguje.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4897edf703846cd6663bd7cbab6b4e73/goxuvuxogulawase.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fec7855155a9a7168dc2fec46c1bef77/68765939665.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aec317772f6---lebil.pdfIn PDF document text
    • http://safarang.com/basefile/files/pijuzupo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/23741776471.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/nanosukumabogagiku.pdfIn PDF document text
    • 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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10748 bytes
SHA-256: c72efd557c9d487de9a8fc60e775877c3f5272ccfd9bb426abd35d87b80c42e6
font_02_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 17424 bytes
SHA-256: fa233beb89f37b11629673b2ea2e7d027522c99d59d99b075885e48913499519

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