Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5603f6ccd5bf1a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 04:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dab71ed1685e5335f4203906e4bab828 SHA-1: 99d710e78a0b31fe434c7a56f18bcc8182961be3 SHA-256: 9d5603f6ccd5bf1addf07c7367520ea7622d9d52a58ddbaa956bef8c70c8ca4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked resources. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://eurogeographyjournal.eu/admin/fckfiles/file/pajerijaxagitejar.pdf
    • https://autoroman-service.ro/imagini_ws/menufoki.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7053c9400---kezigerifaxovanebo.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/562673fb665c554283466d75968854bf/fexonusumaxuravi.pdf
    • http://toyotacri.com/userfiles/files/78842241585.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uimcrf4540fi3tfn6knlamg8t0/gedesegik.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7k58mu230dogfupk0gfbo95iv8/pozeke.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0afcde8cf---vapodaramek.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/50574b52c88062d19feef1b0537d1324/16964332167.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06faa2bb1d---23439537914.pdf
    • https://jamurgoreng.net/contents//files/basodimasefirawiziwofok.pdf
    • http://esejsc.com/upload/files/73417839003.pdf
    • https://marcuspietrek.de/MARCUS/files/file/69799626446.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/efp6jhp1la7vpcbm6baf0to0e8/xekalagekopesifojogof.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6845276f---kerejakared.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e7d7206d---30445117794.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bqkgg8faidberocfuejkr32mv1/96913128824.pdf
    • https://a2designbg.com/userfiles/file/32653068389.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a49a7bbcb---54479192444.pdf
    • http://www.specemc.ru/upload/files/zojimijorixijaj.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceefe9d4ee---biguwixitabopazalajifa.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caac2333edafe4fd8666b571c26412ba/topizaxopozul.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d28870ea279bfc2d3e534d304deb5f0e/11632003763.pdf
    • http://harasim.cz/uploaded/files/xifodoki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=colons+and+semicolons+worksheet+with+answers
    • 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_off0000e614.bin
d3cba971d35496da4f1ad2bf00a963f15754cca202b80a1350136ee6936d99d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16876 bytes
font_01_sfnt_off00011211.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
font_02_sfnt_off00012a28.bin
2d7e2846e4dc944c5d6ca3024afe54f6cf7a00978a3604839233f5c90f940ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 10844 bytes