Malicious PDF — malware analysis report

Static analysis result for SHA-256 b770b39b9b425e66…

MALICIOUS

PDF

83.3 KB Created: 2021-10-17 22:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fd6861b0c2e815414b37613038dbddd SHA-1: 73895be346ebaf4b5b6ac26f88724a5dcb5ca276 SHA-256: b770b39b9b425e66ce510b8a546b5b3db046d1dd97c6db940b5717b38f5e4fbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be to lure users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cb4a436b56---86844270048.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614894c0d1b7b---69848003010.pdfIn PDF document text
    • http://inercial.es/uploads/files/voziwifexapup.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/zizojomexawez.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/wekuxos.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/xuziwaxibadovidipewizu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/85807858416.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11035907665.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/bozelesebefez.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588943bba22---setepeliz.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/6432093448.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/88245086968.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616107b3371a7---zekuremewizagidameta.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/mezij.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/390466747613da6d8cc293.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/lumanedonotaxoxawezowu.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/3575867066.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/32280322478.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/90038399240.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613befb4619a9---67216895910.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3a9c8b96---nisewabodameg.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/tavewofilukegesobudop.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=strength+exercises+for+kyphosisPDF 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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 16944 bytes
SHA-256: 6679e32e875cad60f5130c08df0d0a1ae584acf2a6b85971da14a896dbf13f36
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 10936 bytes
SHA-256: 3a14119b12b2999f8db88fc3e4e12027901b31a20279006240b447e1ac1ba1d6