Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e90e74d898d6de…

MALICIOUS

PDF

100.2 KB Created: 2021-08-04 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9628e9da1e2b0d4692f0eb188fae5fb8 SHA-1: b82d318e1638c7a99ac60c3f751826d7dbfda358 SHA-256: 03e90e74d898d6de8511d5a12b6a693b461eb3da74b7a06038876672ab4b6285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a41d29ced---kotesutifuribukobopo.pdf In PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/80228528203.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9c258acd6ee05c60fe648f273b5c8d4d/92304029391.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/60177796592.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/iltisk8iu1a7cq855uo8rdequd/47896597609.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210627_050624_4655.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/39238518816.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/devogafawijuja.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0ab27451---bebofelexow.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290442099847.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073df6ab9e82---madezabokuvimululu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/vofagobakokipiboxoliz.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wipefenuxigadijebokegeja.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124ab79113---85032232121.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8fa9a39a4a622c8645f442236e1909d9/77195512278.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/91910295835.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dupizojivemopajage.pdfIn PDF document text
    • http://hncastlecable.com/d/files/boxejulola.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/mimojadiwef.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/51i65cpgs1ehe1gblpae7qqse6/kuliberejigamopuz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e89ouiu9cbud6c7egf3gfk2p90/guwemod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=2011+mitsubishi+lancer+ralliart+transmissionPDF link annotation
    • 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_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 20820 bytes
SHA-256: c21b8be00bb1bb190e5c17ebedc5149e137cfcefd4e88eeade1e066ec25fbb5a
font_01_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 10932 bytes
SHA-256: cd53cd1b0c5076b0b6b908b94c200a206a60d8a7d48b4d5f1db2a05bb2a2ccc6
font_02_sfnt_off00016a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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