Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c646665d0dc6e5…

MALICIOUS

PDF

52.5 KB Created: 2021-10-19 15:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 44b4719a91896a7bd8c3782f33da18a7 SHA-1: 0620113a47574018a46a81d1b467ecc21009fabd SHA-256: e0c646665d0dc6e5e63da88cec24748e93a5baeacf0c5dee6fb9e575807d1e26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8995

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 http://rulife.ru/ckfinder/userfiles/files/1726296301.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/78438657721.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/towewesurejut.pdfIn PDF document text
    • http://ned.ru/uploads/files/13741646458.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gepinonuk.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/xozofezipafasidedumuwobif.pdfIn PDF document text
    • https://e-room.co/userfiles/file/fokuloni.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lilisujaka.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kesebizubavidazawa.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/nalufefugepipeja.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/17846054377.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/83432946842.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/kilufigobujapegigirotul.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161650c7067396---81235718997.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/4283067444.pdfIn PDF document text
    • http://biomehl.com/images/content/files/67308797621.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/63142894371.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1178957771616a7a0464745.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/44493073591.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/35717651861.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6a3qg6b9ht7fu7mt26penujs5c/kuwesosezazoxuseso.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c386305493---59263792625.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/p3ccfvvd67pvov55s6ckbhavaf/80333281426.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=yasin+dan+tahlil+lengkap+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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