Malicious PDF — malware analysis report

Static analysis result for SHA-256 847e5f78fde3ef48…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3426c8654c82868428a583994dbdd8aa SHA-1: b67e36b7871745a58bd787e0b6367536dcacf840 SHA-256: 847e5f78fde3ef488374263c6ec1d91ba30d14c07493b738bab96b81c7ff81d1
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, hosting numerous links to potentially compromised websites. The PDF document body is heavily obfuscated and contains no readable content, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t2ccro4hgeag6asiei7jms0lip/rodurefakosex.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec62ac844b---ruziwugixilamuluvuxalupuk.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/biwetesadotakajififasolom.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/zuvetelupatulejudewopawi.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xixibulojewukujajukukimax.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb252c971d372412eda15ced096c44bf/98356424515.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xomegepaf.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/dubilejetunepiwazenimigu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vaguforugawukowonuweg.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/60603494540.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/87490225419.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff700939e0---43466986129.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tuzuk.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/6728343715.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/kazajunerinovizuravopuse.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/44440397769.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/wupojevageja.pdfIn PDF document text
    • http://huiking.cn/uploads/file/011910163417.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/zabikidarajixobuwa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613173a138e94---36166045387.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae534af24---58518345600.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/ruzanuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+android+device+managerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 16812 bytes
SHA-256: d57bfa7983910298620c6f26f4a64ab23bed924b534feb1438eefa09807ff880
font_01_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10748 bytes
SHA-256: 5a8634e3cdd1a2c0be1266ca28236766c42de9d5e1b1183429cc486c82c1733c

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