Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6c89f40ff06e38…

MALICIOUS

PDF

83.9 KB Created: 2021-08-24 22:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b1025a7b79d19e4c221515c1ca1307f SHA-1: 0decdab782b8db18877d1debf37b328d77d63bb9 SHA-256: 1e6c89f40ff06e3810fd9f37edf887e9beaec33f9c9b6c6990c2c38dbe789a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://automotiveenergy.cz/userfiles/file/zamofiw.pdf In PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/37625410953.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dafapejatuvanovigerezaw.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/e60b63qlopu01794cn461c9000/24851291210.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f64cd238d---12426681089.pdfIn PDF document text
    • https://badoza.net/userfiles/file/butunebuda.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/36391181464.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bivuzul.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d63e024b---64128759457.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2f0bd5fc---fesijiludifikig.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zuxudajef.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pokuwifog.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160756d88ee1c4---tofididaxasuwebefobode.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/31212827706.pdfIn PDF document text
    • http://rubensova16.cz/files/file/xabolebovimiru.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/65215209831.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/69af2eaa9ebb19cd954427b7f7fff03c/wulufekexuginulivej.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/vipasub.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/27557818831.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/liguvifisegetisoxanowok.pdfIn PDF document text
    • http://vkts.se/userfiles/file/66126159993.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/puvego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=solubility+constant+calculatorPDF 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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 17720 bytes
SHA-256: 2259b24bd9d16eb6f9c9ca36db83dd58eb79a425d3536023d043a996eb7eb943
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 10520 bytes
SHA-256: beb8f8d7ba1a6e411bc4c17b62b79d4490f80c52c40444617805b10831b51160
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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