Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2078e32cfc10c4f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 16:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b896e2ff9aabb83cb34ce55ad38bc285 SHA-1: 7a1d5f53641b67c83807b51bf0837bc02a2f90d2 SHA-256: d2078e32cfc10c4f6d722948abd90634731a4cc8003c45ac003c1d64e630ad38
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f6786ab33f30c9f74973825283a1d707/63570743203.pdf In PDF document text
    • http://v-lukomorie.com/uploader/files/19344425543.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/75512630128.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/12175509989.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/27591865862.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/90374285871.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/79098463271.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/mavuxomidax.pdfIn PDF document text
    • http://mc-opony.pl/files/file/nidiwa.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/tumedetobodale.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/kopodaxofoneg.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/11654166928.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/meponiniwub.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/56780248462.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/sixobasowudugigafo.pdfIn PDF document text
    • http://szpk.hu/_user/file/63082260006.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9f1fa0450f1b384299bf9bcd7c780251/pamowimuvonexa.pdfIn PDF document text
    • http://mylodge-naoshima.com/mibewafusiligudamamugekuw.pdfIn PDF document text
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kaputejelukidevow.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131a25468c7c---nirevurepepesesopigikul.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/57271423567.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/bitomagusirigizadano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=restore+game+data+androidPDF 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_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 17496 bytes
SHA-256: 1e2e37e180bfb97fecd45f7f8e8bb738b24efb98f53c90ab6b94f1bfa559c5c4
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 10592 bytes
SHA-256: 20322458f55128ce5247f620b64cc662f38fa22089751eaf45c9cfd2f6d3507a
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1