Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9919d017a6608a3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb7ce3cf065db4e58c1bdce7f59c45de SHA-1: bcc6ef670d523aa5b90d529bc1ce1070617a116b SHA-256: b9919d017a6608a36cb79c0ca5f3c4684b9087c40febd839047c6476304831e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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.fishandcosolicitors.com/uploads/files/zawaferuviraxika.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df6f0ec49---kejopejademubajutot.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/54156592308.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/80835056264.pdfIn PDF document text
    • http://hrudolf.com/userfiles/99703179833.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe6568c54---68006966442.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/34391586735.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/65383968748.pdfIn PDF document text
    • http://expresskaliski.info/file/wojadiz.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/73726438733.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160725e627b98c---35590492620.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e496fa70---zelebibi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7fc060f03---40106312121.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/92893369685.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/nupobiweposebefa.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/55281992781.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vunomovogopazovugaxu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/63481688988.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099d74762d39---telewobuzikoloputibixija.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/17jnl2iauo55vjk9c1spkvun56/1733896622.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/78892476590.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wubobibewipil.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9e61629f1ba9e0a68dc17d6345f08ebb/59903901813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kidde+carbon+monoxide+alarm+model+kn-cob-lcb-a+manualPDF 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_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 19112 bytes
SHA-256: 449b3640f928fbe43a5047d99c8f9b479c01129065b2827d50964037c5f11868
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10724 bytes
SHA-256: 90ea003ba8e78b875089c2a403b0688d6afdae89edfee2e2be57423e556dc064

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