Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed15584aff07bfd7…

MALICIOUS

PDF

101.7 KB Created: 2021-07-18 20:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8fd18c31948a251c2f71df3721052e4 SHA-1: b900979df10e0e8c4964fce58e61982ffcce0018 SHA-256: ed15584aff07bfd7e95c4a86c2c2ad5df85d7e310f29c2f5a7793b6dc0a91e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous embedded URLs, many of which are hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple suspicious links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://timebymtm.com/upload/files/gekesositaxuxawusa.pdf In PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/39245928353.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/7787210930.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/golubopepa.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/josuligenavitetotoxin.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fe1489db---xusonaguwuzenuwaz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4813c08b9da5e2ad7e2105958833885d/lokodudajomogepim.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///saxibabuk.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/2884591591.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4a30c224---zumigigameniku.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a2d5d31f---67864682885.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a903e9bc658c926f328b24b7a6aafcbd/58493140449.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12d251b2537a91a79c948679e8b79ae3/javaguduvajikiraferatimo.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fugowovuzu.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/46871883877.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/42jm1s6ltjiuk50m9ubl2vumc0/mapukiwifujosasan.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8872781---94545719782.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fekupozexitogaki.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b17399a08232b1fff0898d62ccfa14b7/wofevabetiluf.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/kusuv.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3e72727f---wavufoneladerafijoma.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb13dc4f0---78261239564.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab086a1a8b4---60037134778.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/94571122948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=marvel+movies+by+order+of+releasePDF 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_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 10628 bytes
SHA-256: 730cfbc0acf0a153c8fb2cc203db57436db84dc21dc6c2290844957e4c3f8539
font_01_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 17664 bytes
SHA-256: aa5874f978cfdf57217339f86ffd93245deb486c8fda21fd32361f10dc68718c
font_02_sfnt_off0001714d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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