Malicious PDF — malware analysis report

Static analysis result for SHA-256 503a647bc093dc29…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 03:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79836067cd1e3f3070bf33760f788d97 SHA-1: 94a006423e61ab7d1bfd564f59eb91a858fb2d59 SHA-256: 503a647bc093dc299a480bbfe2e6650079f65adfba49ef78c09a9c30cd55b588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=how+to+improve+strength+endurance PDF link annotation
    • http://hondasushi.com/uploads/files/kipumale.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0b9e18c5---91561103688.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c262fba7e28---xowanobuduporu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/91634b7ff6b4b04dd927072f35570161/viwamuburezobad.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/386e5f6d6cfb9239d6b8c1fc6914993f/92789604831.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/39072095276.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/52735794277.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/wunujabewejamewinivepape.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607013aa69a1f---bimefirilogaganikaxini.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5dc7f88c---17153033650.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/645cc329ca8fcecaa81cdd6863361b2d/36614767120.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5e3bfabddc9a5526dcca1896d0e435c5/gipujalowoxar.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/41528109954.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5605085e30---nusofixizotebiga.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8034372fe---18622987406.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/86317702786.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee98195835---pojigomipemekixirozosazi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q4k0l97rc02c2vahg1g50tma81/7857289283.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3716787cc8e6fdd2d4465146369180d2/52368759689.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/nulepetu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd386ab91d---6606677654.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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 11160 bytes
SHA-256: 3593a74045c9def56262bc488512e4442b4e6bad83d33eceb23d21f02078f9d7
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 17892 bytes
SHA-256: 01f92953bc1fc158be8213eb39273683cfefddc74f91a1f642d21bcabf4b51d0

Open this report in the interactive analyzer, or submit your own file for analysis.