Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc80b318bac7ea23…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 01:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e4fd2fdb882cd603e50f9c36049354d SHA-1: ae550fa092e46fe18e1d9c66d4aade951c6bd2ef SHA-256: cc80b318bac7ea2342c206464b903acd302d3b51558f3c116f7effab20c6ebd2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates a probable phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=offline+games+free+download+for+windows+7 PDF link annotation
    • https://bak.vn/upload/files/99255960770.pdfIn PDF document text
    • http://ktcz.eu/files/files/25659459848.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd4422d0b---61153191719.pdfIn PDF document text
    • http://spbi.cz/res/file/zotizozuju.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/71a20a0d5bc77c942c5b1839b6eec539/45972645630.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13589126937.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kozusejopovorugoj.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/26efcac1c8d770c179f178857b95caee/sabejafonajidis.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/rubixezixo.pdfIn PDF document text
    • https://pepsima.biz/files/file/nesewozogefisesavajajawez.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/tagetawosudojemibizile.pdfIn PDF document text
    • http://ippon.lv/uploads/File/jesamawones.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/28222513886.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pamedofesuwotivakeje.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15145276098.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/naxavidalijavalotopeg.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/sozigezexinirokigutatug.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xopane.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/51377451173.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/mixewaguzid.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60077117951.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/fosekumodiba.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/nomutopixiwuvelowanek.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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 17216 bytes
SHA-256: 825f6f4bc3b3de936716fc7d386bee1c347cdc483d14d6500b8826a3a6b8b917
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10760 bytes
SHA-256: 27b2dae802338085c6901cc1e0464178d047d395546f9f1a941e877c838d8103