Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a611080c6127b5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 02:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e90de9730cf8152640efe3ee8236331 SHA-1: af8b1a59ed5fc6271d3bcd930c7a38b07b3e6d74 SHA-256: 83a611080c6127b5f32ab98563867acb33367e0b366a2a9432914d23d8c047fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

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://trongtrucsolution.com/uploads/files/8604993476.pdf In PDF document text
    • http://cermak-expo.cz/data/files/file/48654114349.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/89100117288.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/39229743922.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6be9bd1af---debirabekupovolujotifemo.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kigiwegijuzetut.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jopakijetanokew.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/31208338995.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/78317601011.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/ladefimubowupipedewebo.pdfIn PDF document text
    • http://electric-kernbichler.at/porogujulinigowiwesasexef.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/67440218642.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vuxagozojalesuvakofugub.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/27521247676.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/388126613613584d9d1e30.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/mj3aegda5p7gfg26ij7rp53c54/6637535623.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/67384867649.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903154836996212511.pdfIn PDF document text
    • http://regcureguide.com/files/files/kovezunaxasirifalure.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613276b9410e6---fubanitukozukefomil.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2fd275a30bbccc0a1f9714b32f9622cb/23964505144.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/29119635781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mortal+kombat+pelicula+completa+en+espanolPDF 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_off0000b731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB731 10860 bytes
SHA-256: bf1c60d6080d4ae6bb2fee9974c4b1ef04f87b945ecbb4293745df8a9f5a7a3f
font_01_sfnt_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 16756 bytes
SHA-256: 60debc104d31c24d8b009f9d611f2b4e6e646607b0659dfd2facb187dde3ec90
font_02_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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