Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d98e590812147d…

MALICIOUS

PDF

78.5 KB Created: 2021-06-26 04:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6595aec578990d9b2ad78bd73cb71ba6 SHA-1: 20bec74a99031e479e6b76107b582e41088bb01e SHA-256: 88d98e590812147dca688a72140803aee0bc38d4b9d6f0b74f2a1ce57445a9cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://soflocops.com/clients/67403/File/xunupatuzewafugukojom.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8c068c08---pinazuviwutonegesodabid.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3d39091d---delagipevutaw.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cdd5194f537fc07dc7bd3615e695b24/9300269497.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a23dac2052b590ab3af4579482a456ec/kilane.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0d8b570ad6814eeec05724dde8e25266/17410555292.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/43a341a8b3f4031a5a9f6d7a91c8eddb/90346920891.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c74bca9f9ac---86387653206.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093392f742e2---85654347380.pdf
    • https://banderlogclub.ru/Files/file/sapakeruvamorozolonumena.pdf
    • http://ahcxdq.com/uploads/file/29141304695.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/949b1837029eb6a2a2c3542058033898/fonuje.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/70553509541.pdf
    • https://hosvagyok.hu/userfiles/file/73340021654.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/basutefexaru.pdf
    • http://aucoindeshalles.com/menu/file/70693815525.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b180499097dd456c1e03379d942b0831/jakimukavewabaxapavewutox.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/df36085b9c1f76b950741242a90b1b65/19460424771.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/78598260058.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160991db35586e---duzibiwilujagi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f63e970f7802663bc2b9a184ba2b65af/54402697933.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160768ff52404b---55814651347.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc7cc911a8---vineso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=schaum%27s+outline+signals+and+systems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07a.bin
adf8a00fb920304ceeee5da025cb6c02d2128cfd018e9cd7ba6e64488a9b20b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 16432 bytes
font_01_sfnt_off0000fb05.bin
fabf79ec1e374f7fd4fdab7da27fcc1ada6de9fbe280f41336c237f0f7e627a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 11040 bytes
font_02_sfnt_off00011465.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16792 bytes