Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9497745b6eb9ac6…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 19:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f80c23ac2fae8ecea731cffdc6066c81 SHA-1: e0a64e5bd0d60a077c781c9e69ec9c9de4d45531 SHA-256: c9497745b6eb9ac6dd7ed01e721213ec6e11c7ea60eba913d5e0671ae3fca0db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to a site that serves a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=science+class+10+chapter+10+pdf PDF link annotation
    • https://i-chat.tw/js/ckfinder/userfiles/files/mexapokodilategape.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/golurirarike.pdfIn PDF document text
    • http://falerisztika.hu/tmp/53596223390.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kadas.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vudaviwilolipugu.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/3899460336.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161532d16a6730---41160027726.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/nelugujebopopagerawuwo.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/14999901984.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/mapulizabukigirudativuk.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/makusuropojovomitob.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/libamu.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/guwilawakorajugipopevotuv.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/26669973252.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161455c6dc2c34---bosorotuzisavorilusa.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/pukopafudibagu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/28720597028.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e302e2a14c---37683464456.pdfIn PDF document text
    • http://afslab.asia/upload/files/govuvuvejonalivudugifew.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dagekusafisuwuxasonaj.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/58548192958.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/55970036220.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_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 10848 bytes
SHA-256: 68bb6c682a6b3482603560e82e9a2a1d4b9f903aaa256df9f06fa90cba0c0982
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 14520 bytes
SHA-256: 4f8dbc7f52f8b07714b3c246f45192b0d05ab89332a19e3d0f164ba0621a80d0
font_02_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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