Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4d97a630edb3a6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-23 22:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 285420c3de693699990987a968fdbf68 SHA-1: 9dd467482259a2a73ad1d5ae519a26bd1acbd1ff SHA-256: 9d4d97a630edb3a63bc7b5cec84dc5a94fe560aafce4ad877b65523e709134a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aprilboya.com/userfiles/file/60267185892.pdf In PDF document text
    • http://realfootball.gr/userfiles/file/dopegunerebojopuz.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/13905964353.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/31418781008.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/50503373724.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b8a5e91b30ab4b4e72052f3fe40c218/65006186102.pdfIn PDF document text
    • http://navigator-33.ru/media/file/27971430283.pdfIn PDF document text
    • https://scalper.ir/data/files/file/81991883363.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/dofesetemukodaxa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949152b7e0b---1947919926.pdfIn PDF document text
    • http://goref.ru/files/file/16187812826.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b4c013f1---zajiredasewubokok.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/35ad6b3722e3cd3c9f124d2086caad78/pijusegumigim.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/76650483357.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/52067320344.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f72b04d1cb612a837f6951087889679d/zuvazikakoxaninip.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/af16293e9136ef8489b785fca3af4431/21870839196.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609733d129794---duvasemuwu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/igk2e5kugvq32amtl8aj4itv2j/5700808985.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a5ed958d442aacd1aacf93eceaf079b8/nanuvesoxasikesugobazubut.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee542b53---56742406482.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/melubodufixamo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2d7187fa1---35810791841.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd7b8035e---wakemoludufokebolasima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+reinstall+gta+v+steamPDF 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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 17004 bytes
SHA-256: 7a77c6911cf22701d1238e9b1467a4fcf90d187937b85ca42e6ae446547a357e
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 10596 bytes
SHA-256: 677a00cc7636306487aebd7a7fdb33bc8da8a4f4e36cbe2a3ad54a2d42a9c434
font_02_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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