Malicious PDF — malware analysis report

Static analysis result for SHA-256 f897a9744fb711a4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 00:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b40fb3f27cd3e7f4ec2d1d6f3ce7aa8 SHA-1: 78cf8d2176b42f812402aa665ae03c19400457f5 SHA-256: f897a9744fb711a47401da44c1289fcf5d53ebe8b6522a7aeb01e6563551156b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=how+to+graph+quadratics+in+vertex+form PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a69aeae6b---zenavegufomuperesibimoda.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kepokaj.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/1469518910.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/10252874548.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aa009205---nosobodeduminafutuzam.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/ralugibawadopibapapenan.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/newamenewixativowomis.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/312b5e7d996388626ae5082e4d9892bc/vijedovegebajulegejo.pdfIn PDF document text
    • https://birotex.rs/images/files/95816803862.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/31565285195.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/90128506817.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tumugadefixagobujid.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/menulazebipukotuloxev.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/modelixuresiz.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/povimugekexenuf.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/72787485766.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/seleropudo.pdfIn PDF document text
    • http://benrassam.com/uploads/files/88717922288.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/44625259857.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/44828516824.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jonisolofixunolizazazisig.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/9157959055.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/20718941900.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/julob.pdfIn PDF document text
    • https://digireg.lu/upload/kixepolipumixajava.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_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 11512 bytes
SHA-256: ebf6a733da2850690935e472321f6d79a6019c2dedd5c641d41295b197fa49e5
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16520 bytes
SHA-256: 505b9958cd52e200a0e9af7becbe67eccbbddbfde74f51c004b0789a3734a271

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