Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6540e5fdd684b63…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 04:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e13595fd8c22b00eb4bb0a62e87db252 SHA-1: 30a833434bd30c86ea5ac0fe1869fd733227d445 SHA-256: e6540e5fdd684b635fffd4687589330a1899208404a69a7cc2db1b6e5e2a206b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=code+1000+robux PDF link annotation
    • http://weorderfood.com/uploads/files/wefixipukatiw.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/68110892321.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/4428650823.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50413460097.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepet.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/urlcl3ll3llni3ai8q7n6qj6r5/witisorezikosalur.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/jifubemafatu.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/biguritoxoso.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38622263762.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/5461870870.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/taxovidesolaxorojenorif.pdfIn PDF document text
    • https://33mobility.net/uploads/files/fonerabe.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614287d6cfa6c---fodiwalibewuwuwabubojof.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/4788002970.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/levolani.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/9610144854.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/lotufedogezewiwulatumiz.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/negusoxenozixu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/49997929913.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8d5bf577b84426a83f32a177e10d8221/wevawapip.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/84984307002.pdfIn PDF document text
    • https://satesayap.com/contents/files/pazuvizi.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/gajidevugugifufuw.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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 17784 bytes
SHA-256: 8c3645fe9ea09d3dc5b33124dcc02606cb45114404d7b82d4d54d2d1467c3fe9
font_02_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 10120 bytes
SHA-256: 336cd42b7cbaaec92ad94eb30f3cc9a6b859561cc9e39ec151c16fa4280576e7