Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f71c91e595ff263…

MALICIOUS

PDF

78.3 KB Created: 2021-08-09 04:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e18627a3b28c8da946ce5c965a7f2ae SHA-1: 673c81205ebead6982245b1a623fcb7a6e7ba62d SHA-256: 0f71c91e595ff263f559fd6ed9de746c866846dc96af859ece5b42a4ca406dc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting an attempt to host or distribute malicious content. Heuristics indicate a link farm and a potential phishing lure, supported by ClamAV detection as Pdf.Phishing.Trojan. The presence of embedded URLs and the 'download button' heuristic further suggest a malicious workflow aimed at tricking users into downloading further malware. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=download+game+ppsspp+dragon+ball+z+shin+budokai+7+mod PDF link annotation
    • http://anandtouristcorporation.com/uploads/fasakipuvumasuxijaziruja.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d395d266d43d3f903a1a6b75a1972c48/sizitagirusokozukubug.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/51003518149.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r2fbbrn3mmbn3kck7uba04pj41/62923476145.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3ntv4q2c64u8vfbjshggibf3q/fuzozosudatabivomakitebe.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/sitena.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a536faad---16783882393.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a616b38824---dogaridasivo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/164624016560dda29ec4adb.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ngl6ao25ice3m3c6f7hlo6djlc/dafewipoguxolivogutidagix.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/18132354377.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210730065256.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/pofuxepota.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/37712890060.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/46410938224.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/vesuxapadaw.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/gesusav.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/22377592542.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/wigidilud.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/fotomofaxeguxasu.pdfIn PDF document text
    • https://go2germany.ru/files/file/raxiripekosowefeto.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/bilidaginarodapi.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 11272 bytes
SHA-256: 61ec4ddc2d3c6d96f32609de9af0a524e0bbd0ead009944b300861007299212b
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16888 bytes
SHA-256: 0d4c89b501517406df89beec55a5a274665d7539971ead0b0ffdeb500781ad7f
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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