Malicious PDF — malware analysis report

Static analysis result for SHA-256 3135c3257321792c…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 08:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7f3c0222946eacb45ea6fcbde1add74 SHA-1: 770deefb8f0f232e20c240c4947eb6492b50980c SHA-256: 3135c3257321792c891e09df5bafa1c40ce0a7cee3d926ad2584518be6a68f6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://asianmosaicnyc.com/userfiles/file/88061832518.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/29772236470.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/44299d9d98f90e8ef6e2a5f25568269c/xezovekejomuburugakironox.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jqf4vujhu1cb6h6rb5rj91vl48/11420910184.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/35212790438.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1bbjhoteldtoloce3h25nhins1/30606922864.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29fa48310---50252506204.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089150e288f8---13051040450.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c990ea933db---35435351146.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609599129dc96---jevavabadasenub.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/nokibovuratezewokisifobuf.pdf
    • https://amblamy.ee/upload/file/gogejibotivafepadonokiku.pdf
    • http://aweibel.com/Photo/file/dugidozafasi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d66c024---babuzovalorotowapatifo.pdf
    • http://bodegaadrover.com/userfiles//imagenes/83644981503.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3sdcc6o34u2aldg6k3r8f441q2/gefifokuwezopafamoruzi.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160782ac3d03ed---rupuresojoved.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24526d8a73---noxemerugunizitatozose.pdf
    • http://banhangcongnghe.com/upload/FCK/file/puzulasajoxatinulurud.pdf
    • http://edwardlankin.com/clients/86087/File/detamonetoxowej.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/99115338544.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1165bdfce7cf3b2b227b90455220b91c/desejo.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dvgll4bafbgvvl3gu2oshhvjd2/netoninewopolugat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cybersecurity+book+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_off00010962.bin
99e3ff9a20b5c99a72f1f1edb1830b6860ab48ff8df1d622183d3513763c74ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 17248 bytes
font_01_sfnt_off0001369e.bin
412f604b715a0a4b20b000a9ff8c7d5282d3695eaa37c74af6b57c4c863ac8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 10776 bytes
font_02_sfnt_off00014f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F71 16792 bytes