Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d1c5d2cb2dbb25…

MALICIOUS

PDF

98.3 KB Created: 2021-09-18 05:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23495a5b0f349d0440ba2b5cccd4038f SHA-1: 24441e935aa60615e76c0da63ef89d823aa59ce4 SHA-256: e9d1c5d2cb2dbb25611a484e2e323d973bd65bace94e40a9e25a5f478e052373
164 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 directories, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=grid+photo+maker+for+instagram+apk
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/2134763921.pdf
    • http://holzbau-napetschnig.at/75754567697.pdf
    • http://asfalon.com/__files/file/58719427227.pdf
    • http://joinsocialbubble.com/cake/beta/userfiles/file/15659774194.pdf
    • https://martabaktelor.com/contents/files/24190483696.pdf
    • http://poliinc.com/upload/files/dajajoxumajizat.pdf
    • http://sellmysayarah.com/userfiles/files/24462293851.pdf
    • http://stigstudiotecnico.it/userfiles/files/25771812159.pdf
    • http://e-hematologica.pl/users/file/kojuvafegoru.pdf
    • https://istanajp2.com/contents/files/46894885813.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07f6339d4---bataxopejufis.pdf
    • https://wonwon.taipei/photo/file/90889159048.pdf
    • http://buyo-g.net/userfiles/file/55627970648.pdf
    • http://xinxinhouseware.com/uploadfile/files/padigodezanes.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ae0d65e4---zodafogijunade.pdf
    • http://veterky.ru/ckfinder/userfiles/files/39516356356.pdf
    • http://salonorganica.ru/upload/files/95721398936.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a5a84ca773805d1209ebbdce52926a6e/11403143302.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/folimage.pdf
    • http://bpsstudio.hu/uploads/52034223746.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/72328101447.pdf
    • https://valstybestarnyba.com/upckfinder/files/54830527015.pdf
    • http://www.pattyn360.com/upload/forum/files/nixamufa.pdf
    • 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_off00011294.bin
7c478e7a79724b561ca56ff53adfbae772a6908540b9ff3dd8449c306d3de8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 21192 bytes
font_01_sfnt_off00014a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A53 16792 bytes
font_02_sfnt_off0001626a.bin
b40f02ea972605986b611a95a1074d1a3cfb436afcbf4423ac7b3010f5b4a336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1626A 11032 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.