Malicious PDF — malware analysis report

Static analysis result for SHA-256 147ad258fed3dba7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 21:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85b7a8681ea5264f443294f8ab653267 SHA-1: f7220da2cd2a5d78dcbffb7922c6d8f6ca4aa0f1 SHA-256: 147ad258fed3dba780454d0d5c1fa4b89c1e74dc0463081fe017a936c18c2167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://coytex.net/ckfinder/userfiles/files/vogozeloma.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/72130916366.pdf
    • https://kccegis.com/upfiles/content/file/20210906120256.pdf
    • http://zhizhencn.com/filespath/files/20210905171207.pdf
    • http://derkwoo.com/upload/editor/files/rowubosizatuvixirimatilam.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/13913709525.pdf
    • http://szintai.hu/ckfinder/userfiles/files/40198543611.pdf
    • http://smenergy.kr/uploaded/file/4849606446135bd78e1de7.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfi4903eb3r48oprqkdf2ls1v6/37034267462.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d0347da35cf7ccf088eef63582f3822c/66033989265.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/rotijosemiwazumujanub.pdf
    • https://qwert5.com/psum/admin/userfiles/file/51141512458.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/57654876086.pdf
    • http://zuche0551.com/upload/file/36253604701.pdf
    • http://prestopc.it/upload/file/17466614109.pdf
    • http://vnndt.com/Images_upload/files/93658207458.pdf
    • http://gpp300.fr/userfiles/file/19741162292.pdf
    • http://abwclayton.com/uploads/files/30333895207.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/suzuxogupan.pdf
    • http://qianxi.cn/filespath/files/20210906215557.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819a1d5263---55250401116.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/wunubiwa.pdf
    • http://apmnir.ro/fckfiles/file/17894226001.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/599bd1c50b15be3039c1d2a230c30ea2/88501202680.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=filme+online+godzilla+2
    • 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_off0000e340.bin
3f6a453b7cd3fa61bd3cd338fe99bc96bdf9020a03e88de60b5c8664b214bb3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 10384 bytes
font_01_sfnt_off0000fa7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes
font_02_sfnt_off0001128f.bin
3242cf791433a4de77f679a36f306e0ee94ccb6abb4bb8bdb3bc93b0264c95e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 18632 bytes