Malicious PDF — malware analysis report

Static analysis result for SHA-256 004da42289f8aa9b…

MALICIOUS

PDF

142.1 KB Created: 2021-07-20 00:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 8d77672cacc8cc06a4682343f525a6e0 SHA-1: 1962ffdd6303cb47576cb28d9b0fbee1f42c9dda SHA-256: 004da42289f8aa9ba2331bfae0a5f87ab3ccc7e669b6ea4d6a0191421016a52e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c63c1c24c---dogigefozifufipodarij.pdf In PDF document text
    • http://biogenetec.tw/image/files/20210717_203636.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/69178759930.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3meje6plh01uu7otulj1nmo044/28274090401.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4b460c6---poxevobofot.pdfIn PDF document text
    • http://htwy.com/upload/file/netosinagafabigijilof.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74dead6ae---92688544406.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/97ab34c018d4d8454cc9f8e192b61f49/64684343279.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf1553c14---megurudexetanegojivi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/684cca75d5f0eb91801ceef73977681f/bavirojuxifavexo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4aa1731eaf96a0067e6f314ccdc9cf10/19977704192.pdfIn PDF document text
    • https://laser123.com/geektic/files/32548619726.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89bd28036---lijewiribuwojol.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/30457744789.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/56901853084.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/60105200043.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ebc6e7c5---8343698313.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e9b1e2783470c7cb6eecb2d09f0ea20f/parabewewegukevurigal.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/90026117935.pdfIn PDF document text
    • http://myqself.com/upload/files/tufujusemipaxizoko.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16090f855e134b---linemutiwaxajuxinunogiroz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fb28121d---xogukezi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b89914b0---vexexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=optical+fiber+communications+principles+and+practice+3rd+edition+solution+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DB 18628 bytes
SHA-256: 6042360700e8c9df649c51cf8d9ba333e0e61fe888fa209f249ff43b6a456b41
font_01_sfnt_off0001d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D939 11220 bytes
SHA-256: d1e916746d9138d61a37d3131802091c0384dc36e858f705b32d742b430cbca4
font_02_sfnt_off0001f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F351 17836 bytes
SHA-256: 1ee9efb12754f6b82fb4d1f20e7191bc1368c175ff3afa1834df4a4f6bce40d3
font_03_sfnt_off00020eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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