Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03567474c299574…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 08:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c6baa978b981f014fae8084a9017d3d SHA-1: d9d535dc87f699ec271f550cf66a80ce632fd861 SHA-256: d03567474c299574879ad96e7960c2811b2d96eb0bb6115e3188a5612cffb743
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=watch+john+wick+3+full+movie+online+free PDF link annotation
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613664bad4a09---11900515202.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/50036090332.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1713be06a2ddfe389f232e59eac30650/51353055208.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/ledudozala.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/pelujigosikokarezolu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614052bb16fe1---zomajamesu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/10957035922.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jotasipafiwegetigijeb.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/96914610625.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/38672856361.pdfIn PDF document text
    • https://okazionche.com/files/86513198375.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/vipugedusuvemafune.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_182141.pdfIn PDF document text
    • http://henca.com/files/details/file/6580005573.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/koluberogusavokax.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/43022610453.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davume.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/48749407072.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///42118150144.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vazowivirepikaronowuli.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea0ff1d42---dejibeterikopo.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/paxosukumekipetosa.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pijemuz.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/59860320240.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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 18236 bytes
SHA-256: 9e0a6ffd1a1983a166d8fb691ac9214ed225d772181207b3085495f74b05d9cd
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 11072 bytes
SHA-256: 434ab942cbd54289c09a2647cf88372336db66e0c3c221f1e9111a997194008b
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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