Malicious PDF — malware analysis report

Static analysis result for SHA-256 869205a49a659abd…

MALICIOUS

PDF

83.2 KB Created: 2021-08-16 20:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b3376767aac362e1b4b1c32ffdf7b2d3 SHA-1: 6b89d858bc46d8615f566629359ed24b4dcc391b SHA-256: 869205a49a659abd8ad6a44737abaa9171603c46b9e73eb8990654a1ab5a652b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=how+to+make+liquid+soap+at+home+pdf PDF link annotation
    • http://henskeschildersbedrijf.nl/upload/guxunawusewalugawakufej.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/51416458679.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/dukiva.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/tilokiza.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/matofozomavo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608131f5db0a3---xulideno.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dd57qs1v1qe5fh0eaobs4qh3vb/fuwupotixesed.pdfIn PDF document text
    • https://agatanorek.com/files/file/54519572628.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1dmr5tg3okn3sqrb3svo8eod67/dubiv.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5322a1a5d---sezikuvovunuvavaxu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a211b7a9b---10400715934.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92797610663.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/49a80a4d6bc77f8a9adaa142bc571925/11976922052.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/rejus.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/boxuzid.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a5a34850---73148761315.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87595ecf8b---49288431639.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/62266502458.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/98651418366.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/45781829687.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bosedomarixu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hufaf3j4u44ror4teq9p7odiaa/lurop.pdfIn PDF document text
    • 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 10972 bytes
SHA-256: c67fa6f90da490c2d4b31ca2dedf39591ac8fa70027777fef494d568f6a4236e
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16340 bytes
SHA-256: 8004607c18543ab852ed7ff26f308bf5cfd9a825eaae52783ed0a0048a69db05
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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