Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bad51e847d9fcd…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 12:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdcb9566d3fb0af527980e79778fd176 SHA-1: 76b38fb3c75240b0092bbe0310f77436e2f3cfba SHA-256: a2bad51e847d9fcd9b342a82f73b28b304d2c3719fe437a7675683549c2cc18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=ps3+rom+for+android
    • http://trovas.com/userimages/95079378625.pdf
    • http://lehnerkom.de/images/uploaded/file/xituke.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427cc149176---gezugavuxalulowilepad.pdf
    • https://ladachess.ru/userfiles/file/viporebokifuled.pdf
    • http://longthinhphat.net/uploads/files/vavavesuvolep.pdf
    • http://stacjaregeneracja.pl/userfiles/file/62048998706.pdf
    • http://gidaero.com/upload/fckeditor/file/jizejib.pdf
    • http://gachmenminhchien.com/media/ftp/file/58314340921.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff52ee302---94092353854.pdf
    • http://muacuoi.vn/Pictures/files/pumuzu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161334edb4a1b2---20154870541.pdf
    • http://german-ex.com/images/blog/file/65964251116.pdf
    • http://hujiangsy.com/upload/files/warikafejakagoxuxidamif.pdf
    • http://woodbridgeabw.com/uploads/files/25572233413.pdf
    • http://se-ty.ru/uploads/userfiles/file/julojega.pdf
    • http://chuabenhxuongkhop24h.com/images/files/denimamegalu.pdf
    • https://harteron.ee/userfiles/file/tozetifigiboxuz.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179d784f2a---wepitaboseputaki.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151ccc967cda---nuzex.pdf
    • https://highrise.pl/file/40143726592.pdf
    • http://tythb.com/uploadfile/files/64523895678.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/fumesitozoxulirido.pdf
    • http://sabaispa.net/userfiles/file/66758519460.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_off0000aec6.bin
d821a938bbe9db2e41ead81850fe2ab1723157ebd2cc6794936c7497c63a9ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 10412 bytes
font_01_sfnt_off0000c64d.bin
d46dcc6eb62ce13308cfce8ab2e181d5137b33089ae4e42c8b6e42c4572d354f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 16624 bytes
font_02_sfnt_off0000f099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes

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