Malicious PDF — malware analysis report

Static analysis result for SHA-256 3163688b07799100…

MALICIOUS

PDF

79.9 KB Created: 2021-08-16 00:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e66a0e3d71ca09c67efdf33e200bae6f SHA-1: 000bd74849e2ede4d3bf8057dd6f71974a48ccce SHA-256: 3163688b07799100540e935f347bf999cdbf8118c0f55c1505ab30eba5a4fdaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The primary function appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://internationalmedia.com/userfiles/file/18214440508.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/stdqifcpllnk3ct9r9r7qj0dl0/xeludevezuvimeleferof.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xozanujaxos.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b181b37561a---pukuwelemezisoniwepefiwod.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791330136b7---43081811763.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0d2de8d65b61fb491fda463929f0e97b/bifexitugapewegazis.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/kesuritodizem.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xigakulomiwabukes.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801af37e6e.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/75359883645.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d435d45f6a29bfd33c923c6f661c4ff2/57578308527.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/posinizawavopufexito.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb7505507---45097294242.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/66853985910.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/88202395695.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5836f16e---20661181800.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ed14c6ef608830e8ca6ab19ec301c705/20013404942.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c7d94683---rowatupawafejolemizubatam.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160739dea95fa3---72160220345.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/14154127454.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/93624417301.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/zabaw.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/serunajodexisogozanof.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/lasitorev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=english+grammar+practice+test+online+freePDF 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 16572 bytes
SHA-256: 65e1538530c943dfd7885496d0db57a547a5944e4b7e403310ccf9cddbc4fc47
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10912 bytes
SHA-256: 0d017389bc0c2fca9d0498674179106dafbc665e4b8f334ea5272c94dabbeed4
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1