Malicious PDF — malware analysis report

Static analysis result for SHA-256 9626b5565be9c08c…

MALICIOUS

PDF

78.1 KB Created: 2021-06-27 00:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83f37a6c60739b7d05e8366eca684371 SHA-1: 41165d5db7902871fdef2b33a229ad0d83796618 SHA-256: 9626b5565be9c08cdbc042244f7c5152d8d2532848dbb92313b20ddeca07df1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF contains a link farm, with many external URIs pointing to potentially compromised WordPress sites or disposable hosting. The embedded links suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=calculus+of+variations+with+applications+to+physics+and+engineering+pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/342ma3vd1clh90cm7erb84ge15/kadexem.pdf
    • http://botosani.ro/img/uploads/file/74254330537.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609413c124d8d---45355136985.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b5f54f47---30793127470.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8de6a290e20afe273baa574b7b1e24ac/51778799007.pdf
    • https://bititechnika.com/uploads/file/80215903640.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/73761161527.pdf
    • https://detmers-kontejner.hr/files/xeramasoberusofafob.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/jixemirutisunasosa.pdf
    • http://kasystemofkarate.com/clients/861259/File/39676761883.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c077a8104e---zenakowelutuzusavapadepo.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87361c677---82515300086.pdf
    • http://thingsantiquesla.com/userfiles/files/zapizumubepinuxiwimizapa.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/79513231992.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36020ec1b---7469630692.pdf
    • http://amctop.com/board_data/editor_img/file/202105130633.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd92f67d57---78343447602.pdf
    • https://baigiangtoanhoc.com/upload/files/jepabulidiwunenejurasako.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/00a880811a9a56157ade951d1ca56c2a/96826852310.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec9e41a212f41be33fe81b8aa9d2c9ce/59191909646.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429104629197208.pdf
    • http://ndt-tl.ru/upload/file/38086637248.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c0f1b15ac114eca67d3225bc4f189026/53052670276.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o5qhs569062i9f0r7tbreurjob/38816910040.pdf
    • http://adamlegal.com/userfiles/file/luvelaliwiwunova.pdf
    • http://aldo-ins.com/userfiles/file/zemopepa.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/476437bae5caa7e7343c9de50809d95e/lomagasaveto.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0bae2dda5c489aefb387698700e1a28c/94819591017.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_off0000ca7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 16792 bytes
font_01_sfnt_off0000e28d.bin
9505e1698e46ab227207ee47f6652bd056a2b63584f84c2fd79980a6ab78d52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16764 bytes
font_02_sfnt_off00010d8f.bin
6d4095e4e3321d2b07f127cdacb652442aebba2eb365df1f12eb81496e405e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 11296 bytes

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