Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63ca95a43c46ce0…

MALICIOUS

PDF

63.7 KB Created: 2021-09-14 06:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 862ce842ec607202e4f046a2f9c30c0e SHA-1: 293abddf6b175c6900e1ceee862ea987d49e35ac SHA-256: d63ca95a43c46ce018408e2457c99b6ef9113ecb68f6bc50db2ce13faf2ea39e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. Although no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://sts-cct.com/app/webroot/userfiles/files/76130379692.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xamasomazuzafijodaxuxojon.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eeng4116600qhnv10k78vs3ucq/60823522033.pdfIn PDF document text
    • https://andana.us/files/files/bageliv.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/70254073265.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/39077805668.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/69404142035.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/7075510274.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/81947764167.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuxevapuj.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/31409008848.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/faledevufudokosake.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905065152.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/newizunusevi.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/97173966274.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/tolunijekenuvo.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/64823064046.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/lobijenumevemipavefab.pdfIn PDF document text
    • http://wdnederland.nl/file/85598660740.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/kesuwodanogogoxaraz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qlr4er268vsqbvdfgfnl2magnu/fosoxemifixefijajefo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9ff171ca3d6d3b1fa191d89647735222/wexubinopotajetov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+v5+download+for+androidPDF 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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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