Malicious PDF — malware analysis report

Static analysis result for SHA-256 9454b62982514d3d…

MALICIOUS

PDF

83.4 KB Created: 2021-06-11 02:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b50aa7cc5008ed9ff140280394d45543 SHA-1: 713d6af1fff54a98d5bc0ce7be348b5bd779723a SHA-256: 9454b62982514d3d3092d1fb5c485bacf8d46e6964f4a03c8b4a7b30903e560f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of external URI links and link farm characteristics indicates a likely attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=download+hill+climb+2+mod PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917ec499eae---56710168900.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/32644850912.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/81656512409.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a052424f119---58245280630.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/381ac1479ad312b98c4f0a6c1c222878/58460091519.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ng6vgm16squh0t116cc6ki01mv/99801068897.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1b2c4421---93801636758.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c6254308---lanegarewagiraf.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rc4ot1fkqqfu6pddomo74noc5o/52859368061.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b8b52b2c---79910735245.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/94809136780.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pkj9akllrie8dg0tbc9qvb1bn1/jizarad.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/v9tkbujiovel0lo4arsmvgtdj2/popuruguzid.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/75mkr3046qee0cfhdmqe01slmb/xijumedikililaxofi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jjqtotok0knfdaor03i1sphtb0/gurisusekupuwokofuvupowep.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e185a3e991afed9979f3cd4f14d9b35e/39149948241.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ea0f1b1659473ee885b09084b8d5448a/feworixoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 5268 bytes
SHA-256: 4675f57c680a8a1964aebe78041214217abd5dc78bb87a56a8320852ce0eb77e
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 11096 bytes
SHA-256: 2a27b0265db3e8d8a39b8b30806b18c7794b9d48d9c0769a0d7bad313475308f
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 16168 bytes
SHA-256: 2732ee4e6fc52e1f0b465c06e50f5b132505da02cc6e93ae85b7d8375cfdad8f

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