Malicious PDF — malware analysis report

Static analysis result for SHA-256 e449110a8492f1f0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 21:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 448c5a821d54046f918e955978db77e8 SHA-1: 02cfc7355017279c9222e15d2dbee4ad05c1b1f2 SHA-256: e449110a8492f1f0f60e0b426bfa232b569b5af2fa9be8bd3b5761ad2642b6a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/626f33f78b2384880f302ea137d85167/11227583979.pdf In PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/fe80be2481cadec988ac59c88bbcd0cc/lasak.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/linufodatetokiluka.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626610387.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/54027402848.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210628042754.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/24381642279.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff768d3cb---825881365.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c98bd0a271---kusakusavikuzoxedoso.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mumizej.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/87091e59ec8584c08e36b999f6d7eb73/80712468066.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/tekev.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ec0fc345af5678917a10dc101405a90e/kazanevabowugiwukam.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/senijuminode.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210619181505.pdfIn PDF document text
    • http://w-mill.jp/images/file/ramizavomokob.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e81af1a5---nenomon.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085589d05a47---63613013292.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072308022151.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/eb999ed3ed82cd18dc2024a1ae56c8ac/vasupukimetodede.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/63420295827.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/59118930753.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/lixesinisut.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///tutalibuxipelaki.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfo8rg955h75j0atqhhnkgt777/38058353500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=setting+up+a+charityPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 17956 bytes
SHA-256: 2440d4df592e24a187097bba7adcef72b079c9b6fd62b8582d1879a121b16a22
font_01_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 10608 bytes
SHA-256: 256bc9d97ef477f612ea1949b2996c8d4e20b283325a5b4d821f5f744dceee45
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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