Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4da9170d52e9f64…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 13:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1796a9c524209b0d00b6f212eda00e8a SHA-1: 7d38488db95bee4de59aaa10a16386e26a87d045 SHA-256: f4da9170d52e9f641b8a4cdff556e806198e40ee8c57808b771a0098ffd24055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://lmcmanager.com/ckfinder/userfiles/files/vepemavubugokosazijewum.pdf In PDF document text
    • https://rabudiagnostic.com/userfiles/files/safurajogukapusib.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aea354713---90942196685.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/kiwogezimeveteko.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79539932955.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083785b17120---55157003505.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/logokeb.pdfIn PDF document text
    • http://anupbolivia.com/images/files/davarifonebolakus.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/22490691299.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/moturexukejigigowigapi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/tabivekive.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fa3801b7b19d1eb680f9b904a5ab0203/latimesopexajuvakij.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/59d159c4489b37cb1fd7e0f0bad9ca4c/3464950784.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fizodinalelubenor.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7rhhpfsdtoddae3l2oknbqgf8s/wadaloza.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f8jk7v104okm7rbiupctq46da3/92322301932.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/nibevisitimarili.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-18/20210718122843386020.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5f865603---65561078633.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a5799c06991e870e24fd3460e14f0b93/wisubutojekujetir.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/totozewuxu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607145f84fdb8---12943204332.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/24443564572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chinese+new+year+preschool+worksheetsPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 17428 bytes
SHA-256: 06d7c047777ad66e6cdda157f1380b03bdce9d9a1ae9e8428dededd3e0a2a24a
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 10796 bytes
SHA-256: 12ef5d2fca19d447f088c6f23e14836a5283284ba9bbeda05c8d77429a9a83e9

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