Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bf75678005fb1d…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 21:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce798865b82098c38b1fe689d2f8a3b2 SHA-1: cc852298d9af7c7700c8856c35843d89c4dd7d49 SHA-256: 21bf75678005fb1d13a7171109e3dff1ef63018cd69b6b29f05940cecc1080d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many pointing to compromised CMS uploads. The embedded JavaScript stream and ClamAV detection as Pdf.Phishing.Trojan indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=overkill+3+apk+mod PDF link annotation
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gubomugeligabenuj.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/24940092360.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16147355c6a395---bikutot.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/61013199719.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/53056509450.pdfIn PDF document text
    • http://agavietnam.com/img/files/70291839154.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/foworedigenimi.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/96639936880.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/13567102187.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/3968609411.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/82929673083.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/korizogorepogefojesaxoso.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/sigogej.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fadelisisogekumozowetedud.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/26b6abecbaa39ed0e34245ab12a58ffc/632118486.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/zadenoju.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/surezesafowelisex.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/60004873562.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/soxibizukikavuzifu.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97620422709.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/zamubule.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/dizadufewebol.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc98405a2---1574420230.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/28449658974.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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10536 bytes
SHA-256: 8c3a38a2ae374d6258d29c37fb35da65a28d595eece26fac3243af96fee39130
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 20628 bytes
SHA-256: 4e0ec54cbf656e1b3ed06104d346d9cc1323b5f9bd0c12d293b27f5754788765
font_02_sfnt_off00013614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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