Malicious PDF — malware analysis report

Static analysis result for SHA-256 d963434038187649…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 23:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db7fc4853c06a070a4b486b436e16304 SHA-1: 7209afa0fac11d62e394337ae8394217366568f2 SHA-256: d9634340381876491838f456ebf2c5c6dcdc2c1527c348842e0443a011d2c834
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2e454d59---vijide.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a046f0b1b91---fepibobewawa.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084a30e51f6c---43561460215.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faab4639d---62099965471.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/62950486309.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/4991440591.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f021396af7---5053904073.pdfIn PDF document text
    • https://anup.bo/images/files/58899267736.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/80713460482.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/bipejegon.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/99d92f8fd38f38fb56105d1a1aad4934/bavomu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/jenozuxexizivugon.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/39121314857.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210730124844_ovscbu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78542df991---46557665981.pdfIn PDF document text
    • http://retailcop.ca/files/rozuzedorogeboxolijupumam.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bc47a1e9---makoboburamesoxo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tp1ae4rc0vik3h3bl3pl6q2a85/75505566100.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/lemomoxaxivadodiwedufa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abe7adbab---ropozivoribozakadoju.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/zopafubop.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/butonitixinupugag.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1185a957e68aa9bd55c096d9d2cbdab7/65030679809.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/gabobodivabepif.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/puxagow.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/91884741832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+some+unusual+names+of+south+carolina+townsPDF 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10780 bytes
SHA-256: b7c86b30d2a45efe92df401ce862dccf3cd68dd2445991632db752db7c77a542
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16792 bytes
SHA-256: a3bb56c67a3d9f6009efa7e6fff0488835250de3376056e9bff3cf5f816f13a2