Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1239c8dd0633f30…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 05:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2ef3716199651b031c6fb0d0953d944 SHA-1: 6d8c212a489b6917880f11e04d5034dc2cdf49c9 SHA-256: d1239c8dd0633f300c161ad776a177e416d20edd35d648567a63bf66d45777ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some pointing to compromised CMS upload directories, suggesting it's designed to lure users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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
  • 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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d73d5a5---39052200885.pdf In PDF document text
    • http://wsp.pl/userfiles/file/totalebosokegusamiraxit.pdfIn PDF document text
    • http://annabarons.lv/files/files/39051627510.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/39040820898.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/2158898526.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d28d64eb8---92907069916.pdfIn PDF document text
    • http://freetds.net/userfiles/file/gobuwunegulimeg.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/rakamuzavigakejome.pdfIn PDF document text
    • http://metallpress.info/files/jurulerogamojaku.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/93908541837.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/98405389728.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/rakolukazukawazeme.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210918_DEEC766CA8299586.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a958b972d---29538867661.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/23173969062.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/bunabivew.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rj3kmes7uvj35r8j3ph7opa206/44801593017.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ecb483ca10e104d1d9b4ea0a25fb7b45/9432647877.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/80953013674.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/mapaparixe.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/juloxalubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+can+you+tell+if+someone+read+your+text+androidPDF 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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 14824 bytes
SHA-256: 31539ac8ae6d256f6b3cc85a24bdda3a2080588e7c025e839ee7471ad8ee0539
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 11032 bytes
SHA-256: 23516db6cedc7e907ae9b2c8ef0fe9d4a33ffdf98320a40c64c3ef285ee2c0f9

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