Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c42a437ec96cd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 23:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 431979983e1a0804e8661dfb83a63c9d SHA-1: b859cb79676336c81def9d57980ab6b9c392554f SHA-256: d49c42a437ec96cd583229cb58d401390c4e4027cc0ab0200d764e5a15d6c6ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised websites, and employs a 'password-protected archive lure' to conceal a payload. The embedded URLs, while some are marked benign, others point to suspicious locations, and the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ek33fk0jdhs3c57t221n4bqrvh/3647616410.pdf In PDF document text
    • http://mcutech.net/upload/2021/06/file/1623840239345094966.pdfIn PDF document text
    • http://darienhighschool1961.com/clients/6/6a/6a5b14ca9cca6c9c7811e238b5dc87af/File/difojaguxubafaj.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ecfnrinq11jrn0q7q1127ihpt0/fupese.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/10421093123.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8274351bc---9960264660.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/pijeropumezapogatamisinu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ee679e8e0aa0df66aad439fa856693eb/kunixulisiwijumutu.pdfIn PDF document text
    • http://fitviewer.info/files/file/xinivi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/361b1a23fdd45407fbf04dea9907bea0/41788789124.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3803b1503---zaxafewokedub.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/85479531754.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202108220207552691.pdfIn PDF document text
    • http://short-story.ru/upload/file/linuzilizukaxajejur.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/wifevumozefarurugoravi.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7770dc2a95db1dcb554a526654ad8afa/90433839412.pdfIn PDF document text
    • http://allycatering.com/userfiles/30784417601.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d353d6ed82---86321046661.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce41aa10a1---44597724707.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jinew.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/modawebe.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26361490383.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/11kvdl6lq6bvvbtiqpj7kreqf3/kapuvusexefimopikamif.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7d79f79156265632c6bef573da0dd5af/jiret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=moeller+pocket+atlas+of+radiographic+anatomy+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_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 11264 bytes
SHA-256: 7c5306183065e8983d64d323cb91878733664be657195bb93c28c9f8e854c8db
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 18600 bytes
SHA-256: 62a5f6d40e07ebd5f38a54a8d0b80ff17e224f5ca73b1c39638f9a2bf14c12c2

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