Malicious PDF — malware analysis report

Static analysis result for SHA-256 0899392d8de84d33…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 18:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23eceb9ac4331e5a6bfe0da113c597b7 SHA-1: 682ba4330dd631680891aabfe963983d55d32085 SHA-256: 0899392d8de84d33e99e2d1e87130c9292e2905ea03c31ec059a7aae90f81873
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious content or facilitate phishing. The presence of multiple PDF link farm heuristics and the overall structure suggest an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3644db887156ed3f426a2ed5201ff63c/56083865085.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/60c01122e32c1014c2e50fa3ca1fc749/22962730003.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kosefitoxul.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/98cdde640ab52dba5c5cf701f9e8c260/wafukuwefejamumubiwanorad.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/74142abf63b556729c2efbd815fb9e3a/6879371545.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b04eb38a9---gaxaxisugidoxawaj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1c09d9de---dipadudezi.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/valutewajafavutunasasopi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16099af74081ae---sewafugogovugekevupajoju.pdfIn PDF document text
    • https://efnnma.org/files/file/nipajewajobu.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/46715281533.pdfIn PDF document text
    • https://master-service.ro/images/file/jugobiromijinukodaxi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/720a5362bc526b15003c373f62c337e4/75489845789.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/70856332398.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608739d4929c9---4609240296.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/8282939604.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3tthkqbta7tkatelt8rjme47ap/zoxiga.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/96239604444.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b27ecc940---wutafem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1660680825609fc26519f8e.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1f2g9esqn32brq912pea15pn44/romupaxunibute.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e6007d70c181190f43c23d86faf37475/parinunapebud.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085afe22cc28---68411468545.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jerudepunolijokofekigal.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vmkgkn7ci32nvqpa2hlcokg5o5/sinojetibelezeku.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gp28r4a6ol7i8loffrhf68ml6f/tolipumusoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+private+photos+in+instagramPDF 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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 17548 bytes
SHA-256: 1a1b8e0e3b8b95dbb5c051033ca49f3c18def4e9f87b3c4083de76e0e9d50ae4
font_02_sfnt_off00013bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFB 10796 bytes
SHA-256: 55ba45469dd5a70bb32dd8a64a270007734238db5e27d2d4cef651e8bd68c1c7