Malicious PDF — malware analysis report

Static analysis result for SHA-256 482d5f84d74b7973…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 02:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 223686aff3d31993ab66ae9c687fed3e SHA-1: abc195a7347055a8ee1ee6046a3d9054c69def94 SHA-256: 482d5f84d74b79736eb806b85165f33de33d4577958f19671023dd86cda80977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d23817b919dec10a8fe6ff793975ca69/56725082620.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160785d81ab6d5---72665226309.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xalofogisetubinokexuvutat.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/juwinokutuwo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16125e088e3389---6593931653.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/lezape.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/winedukor.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b208f50e652---65869602061.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/befisepudiruxikodezike.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0293759538b910ce1ca484d53a9857a2/tijijawedenujumefu.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/xepisixupixivij.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/68338029020.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c34b6a104c2f1a0cf3073d2e0a800659/sitowuwiduwulokutig.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16280142123299.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/67c3pvnm2lege0batvls50nu2i/56330541236.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sizawujutimobivusubuzariv.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/lujupeminotawagirezakenej.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b1e1b73866680ee2c9a0c86911c4c8ea/zuvuvabibebixizixe.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070933ada598---kojipawuzesaxotozivadona.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88488653983.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/goposajudopibifudalozel.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015f95f6da---pupenotobutumorodo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc6bdca92---zajigubemajos.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c9fdba92---43067213144.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/dirimobasafowivujonevesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=risperidona+2+bula+pdfPDF 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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10796 bytes
SHA-256: afb28b86dbf1f003c2dfd04127bb8606dc08b9433e64a695d2ef7ea729b9565b
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 18308 bytes
SHA-256: 4bfbdd4831b4a25c6efaf62106d9030c30a46b989a469c819d02a53cbca3616e

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