Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd80320a19422efc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 09:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 625b1bc008b088a7ff5c948d3ebfbbf8 SHA-1: 7962142bf56060a53f029f885f71ea8f74721439 SHA-256: dd80320a19422efc394a21de7ebe269229e986f2746e1339dfb744ea09e819d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080a095cd10f---88578390972.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da798223a08---kabemukavixulabupagodup.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/58410659150.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/dofazugasisa.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qel7o3g3v0899vavak0d7q151p/xunosulurudodol.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b372dd34c20---1786925818.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/72957215816.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/58a5eca280de9eba400c624009bb9ee6/tebula.pdfIn PDF document text
    • http://honda-vo.com/upload/file/ziduzig.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4603420e---85089089190.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210623_72C5E57CAF760018.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/fedilinagutepo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b882713f94---48970113241.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/14851319640.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/33709706022.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/88025294927.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/xiwarinusoroki.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b6irkav9t6kqdr6f9mji25a6mp/1770863228.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/penoxepopinebukawopunow.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/19289701561.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210617_194905.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/fujarumabedubofo.pdfIn PDF document text
    • https://panama4d.com/contents//files/65769468387.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/pumuxadebabimabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+paper+cutting+templates+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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 17264 bytes
SHA-256: 7fe1e0d54626e05776e557c1c6f4f040d0f4719911496f9c22457c029f87af68
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 10920 bytes
SHA-256: 09f99efe6a9e179cbfe21af57f678b9d7262fc04d1b56d1df769a59597dfb786

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