Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd51f49909edccc…

MALICIOUS

PDF

92.8 KB Created: 2021-09-20 09:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bc3692cb7fdc842b732813bf008a2d5 SHA-1: bcb8d66f88f56ee1b001d4efa262ea4771c22771 SHA-256: fcd51f49909edcccf64885e75ba46602a82f2d247361b88760e0420001efa5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or link-farming attack. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://pixomot.ru/uplcv?utm_term=turn+on+bixby+voice PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613108743d3af---tatobas.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/92f01ea07715ff4e9ab61f6b8e936d1b/fepovuxebumovevivakun.pdfIn PDF document text
    • http://meskerjager.nl/media/files/21581284452.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/39144006622.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zidegipixorufijudivi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/85ooco7hcj5v4ufmg48s1h218a/60484857362.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/nereguwabimewamuza.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bojunibomo.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/kenazuzikov.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460bbfdcf52---fukatepuwazizonodezofiriv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466bba86006---70512538516.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/88773343963.pdfIn PDF document text
    • https://solturism.ro/images/file/13627340893.pdfIn PDF document text
    • https://ikansambel.com/contents/files/71915104892.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/60302824406.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/mekiwonopuxixul.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/90115933051.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae78b44093---40801368674.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd5e4b87eab13bfa1fe45e364c29f76d/zulezatujad.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/16308903352.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/pixonulilurixuxonakapip.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/33152805675.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/58653561701.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50665118070.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/tukurajumipew.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_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 18056 bytes
SHA-256: 190d5a58505f0a4a2dbfd389a7062ac5baa149867594ad36f81c91a6c2f86593
font_01_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 10236 bytes
SHA-256: 4b81f93a1b76edc1c505ce231b124c1e3f4eb4597666dae96b0b732b18b561fd
font_02_sfnt_off00014de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1