Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c8db9ba0c77a8a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 02:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ce8c9383451995ccd628548bcdd4e6b SHA-1: 6a336b98089ebca297b5b19e6f03874323a7e5fa SHA-256: 99c8db9ba0c77a8ac63483b286b49b5625c4a78867aadee67ecdf7aed172b2aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, with several pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the heuristics strongly indicate a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/611908d1957a0446936dce4e615b2fd8/8326988000.pdf In PDF document text
    • http://hmondo.com/userData/board/file/tirununipemame.pdfIn PDF document text
    • http://dongphat.net/upload/files/76370271761.pdfIn PDF document text
    • https://electroagro.es/pub/files/41151067148.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/buzekavudob.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dizunofubuf.pdfIn PDF document text
    • http://kalikraft.com/images/file/xegule.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/xusogexugefulitarotixes.pdfIn PDF document text
    • http://industrialdevices.in/uploads/jazoxipeparefejo.pdfIn PDF document text
    • http://jaht.com/userfiles/file/84359468821.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2b6333a6---51199649718.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/sepisivaloganixoxumip.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3aaecf17---72633208485.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/volexisokija.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/81664045053.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/81255547869.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f13ce18c2---3568853542.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fb6f447fdf349e67bc90297738ced97e/82313027531.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/nuvukujajifuwur.pdfIn PDF document text
    • http://irths.com/upload_files/files/jomowiwupefebumawezibi.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/dogupe.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/47866626822.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a17817931---99478253543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=american+orientalism+pdfPDF link annotation
    • 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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 15084 bytes
SHA-256: 3cb06a46c9747d5511ae087a8731a38610903b43b256126e7689eade9ae51aa3
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10760 bytes
SHA-256: c200940dbaa845f95da3c5e468d6163c2ff036acd82f332f0f220bc79507784c

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