Malicious PDF — malware analysis report

Static analysis result for SHA-256 b889dd64019238de…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 10:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28b7b202747d5eddd89ce5963e4bb56b SHA-1: ec923206027c3adff35bb42a48944c3ecf120978 SHA-256: b889dd64019238de7adf6db181663cd563f8d636290d1fb43620b84c06e50a34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thokhoavietnam.com/upload/files/wosafibuwukutosavaku.pdf
    • https://petandpuppies.com/userfiles/file/80392950743.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b67c879815.pdf
    • http://newkontakt.ru/userfiles/images/file/walidajofijakumigaviku.pdf
    • http://bluelakehomestay.com/uploads/image/files/rotavikixuxadelofaxo.pdf
    • https://aucordechasse.fr/vosImages/23023355191.pdf
    • http://phoiinnhiet.com/images/uploads/files/85748488794.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/tupatowojuko.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0b8df27ce---jokozesisovaluka.pdf
    • http://baldonimarcostudio.eu/userfiles/files/17044039722.pdf
    • http://ajivikafinance.com/userfiles/file/mukavamumagusuf.pdf
    • http://wpchkg.com/upload/image/file/33297616545.pdf
    • http://cn-junsheng.com/upload/file///202191125830656.pdf
    • http://salonorganica.ru/upload/files/66889999291.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q6thhld1r8nj6v793htt87h6j5/limikivububatir.pdf
    • http://urotunisia.com/uploads/FCK_files/file/28016329791.pdf
    • https://stw-nowogard.pl/download/file/migatazotojagab.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/motepigoleletewu.pdf
    • https://hunglivet.com/uploads/files/202109150437559273.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/begpa25j6hmtbnr3e61snt7u91/dizinelokipe.pdf
    • http://kristaldicarlo.com/userfiles/file/rufivokowomarimajijesa.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/mexizoteku.pdf
    • http://thesciencenetwork.org/uploads/files/xivuzufedurav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=eclipse+android+application+development
    • 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_off0000b38c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 16792 bytes
font_01_sfnt_off0000cba3.bin
08802418d19cd7be7ad6cc63b04016cd44b38bd6dc527e109a49de3b3286b426
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 10724 bytes
font_02_sfnt_off0000e43f.bin
e61f932aa142b6657c505f99b0f6bfdef04d7125e43718af25791ab40245fcad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 17116 bytes