Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a078ec67db94c8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 14:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eeab5f8c0c26ac97469ee2b1ae98b1bb SHA-1: df89a9a5f8e879aa5e4741006dd5d9d394311a16 SHA-256: 82a078ec67db94c82773a469f29a8af4bca166cfc2e5f96fbf67a6399867e612
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=assembly+language+programming+lab+manual PDF link annotation
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tr3ir2chal7fq1i2b0af9v1pba/53433307073.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/rozozuxexamefapurokadeze.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee2d39daa---6669061086.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/95319065755.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4cddd5039340fc7ad1b6acee3bd89922/86872241109.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086827a57713---28926430489.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57554401e---66481984668.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lr31f8najvb7tb416kfsnvb8s3/53502957235.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/17045758916.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f96ce2ba4bd---87604716378.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wazopuweris.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaad7b5f22---beletagimamowifaroromave.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160810859889ef---nipizaselus.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/3142514211.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4b050eaa771972a6e29703f97760c03a/66532440954.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/nuxizav.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ziwuzonaxolupamoke.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072939af2928---ziwovezan.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fumixa.pdfIn PDF document text
    • https://negaratoto.com/contents//files/kepoxedisevuginoxoxuwepa.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/nazejawobadalimado.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/fajavibuforilenekawuva.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/34409551053.pdfPDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73436993408.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1103f5a3f2---87042472692.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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 17664 bytes
SHA-256: 2ae117b7c668e5741da156c9b827cb390c148b1391bc7770282c9fffbc3f5848
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 10832 bytes
SHA-256: 0ef2b46edeea96e35c2bc3e307a7bb625fbaf4013d819343c2bde49eabbb05f6
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1