Malicious PDF — malware analysis report

Static analysis result for SHA-256 efda3946e95f1698…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 22:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02e1c76424215741e58a37915713f5de SHA-1: 80da1fb316c2de11bf21a229f58f2303390bc325 SHA-256: efda3946e95f1698904ed27d080f03f0d8d9599bb22e3ff41f9b4be6850cc4cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not contain direct executable content but serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e049a0e11da00a99f548036b8ab768e7/wozewamu.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8adb02236---gexuxeges.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bbjncrkdlnm8ljqh2tv0q9rs82/kofimovuperu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5b5298b5c76ba2ff3b977513c5591b3c/17413654843.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d2cf890cd602e6a5b84399c7fca1e0bd/26584818183.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/wesaberufuvufoniz.pdfIn PDF document text
    • http://bakoca.hu/files/file/sagupesasodi.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/19131378742.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16230483596.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf313945a4---vujuribidogutonalubuzu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612adcbe2ecae---72661625059.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c8975486040aab1ba0aa814ff4276858/garanajitamanijow.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072605024496.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/adad3198b99efa101e8f95cdaa96f079/kutazefowomuvupuramadovaw.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/12346243551.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1729b3cb---rarebozijudipe.pdfIn PDF document text
    • https://limsurempat.com/contents//files/23697538855.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vagulunalarigase.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/45563185881.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/37615828229.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/8459933307.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/xitotilademirosif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=quadratic+sequences+worksheet+nth+termPDF 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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 11072 bytes
SHA-256: 83f117cc3e5c13cbcfc41362ac9af62881913a89e3d6820838d220881a32bdc3
font_02_sfnt_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 19092 bytes
SHA-256: 6a5c87b4d9b6415b3d08fd3d569565b8680cf369e5e8957c80b322e50a9f0b1e

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