Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8618b5bace3256…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 06:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cce2448b9b03b2185813e0bdb55ffcb SHA-1: a07bc411a95c5f2ce5e5199c5dce9acd29dd5a7a SHA-256: bf8618b5bace3256cf4cf67580617461c38a3f3357ea4f921fd296ce389f1d3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://videlec.be/ressource/file/gujogufopadejobojuwoluwa.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/64bca9fcc976b52b9ab5db719eb858c3/53417186468.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/51206298282.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/balusipa.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/67323660552.pdfIn PDF document text
    • http://www.polni.si/Images/files/musubiwubomu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9db73f09a---tevunerabuxevurulesitumet.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/33274876594.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cc3661277e9e49c51b8ff0a2d6ec59c0/rixifa.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/11598153007.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2386f7a8---91226394920.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ab99be649---loxegeromabolaba.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/11139211292.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c04c6d2d835086fef16074c01c546ea5/kivasix.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/66392852543.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987efe55f8d---guzikozawasuvuxeredesasa.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/jakasufemimowilolevusi.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/15/fekewu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a1f5b516a982f370a7a9bceecbc3cac8/rilopimolaradowerurunixe.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/47491030407.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/858778c72ad01c82e243225eccb39ec0/39567884170.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a14f0e2d4---82755176852.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/beribizitarepize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=system+analysis+and+design+notes+for+mba+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_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 11168 bytes
SHA-256: 6b94fb02f188c074c6ae7d6cb8d878fb64ba4727a93b6c0a8aee292ad99995db
font_02_sfnt_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 19272 bytes
SHA-256: e21f377b785bfb2bd29b5b5dd986dc31c3b2810b7755ef50af148cc51ef4ae78