Malicious PDF — malware analysis report

Static analysis result for SHA-256 694628cdc110559d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff969933fd22ab1f921f8e6d55e9bb30 SHA-1: 5e90c22d9ac25cfdd40604fb43ec1a05a86741a1 SHA-256: 694628cdc110559d659bc0843dee7155365b41b969a2dbf319328020b7fdb956
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd427715db---bemojopo.pdf
    • https://planet-for-events.de/userfiles/file/govawigopikuzupesabugima.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839be28eb79---69861171052.pdf
    • http://studioego.cz/userfiles/file/17568397199.pdf
    • http://asianmosaicnyc.com/userfiles/file/zakisuvegexodikage.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/wolopofimefugov.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1fcd9d33---58455977446.pdf
    • http://nutrisoilvietnam.com/upload/files/98961484147.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717457807a1---zugololuzilitaxidosano.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9571c35430f6c16c935fda10bc208d12/42653363079.pdf
    • http://frigotechreina.com/userfiles/files/95084545488.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0e17ade8540f72f389d5b0f4a9560829/fefewugumezite.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1eac6830e2b5013133eb8ed15ce91dce/68048228219.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/39332041174.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8ccf3827---gewisufapepogubemi.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p40d59e5rca3f946oc35pg4mek/fokeza.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f01f49ffa---fejoviwefoboxagatuzil.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f599684ab7---27398055156.pdf
    • https://groupunsur1.com/contents//files/95830643437.pdf
    • http://lycee-elm.org/userfiles/file/muvinimejiguwekopop.pdf
    • http://canvangdientu.com/images/file/nexinamelixeforexa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00baeee43f---9071122771.pdf
    • http://worldnaturalfood.com/image/upload/File/85117490590.pdf
    • http://salukool.ee/upload/userfiles/file/kumopadaxuvadupamafud.pdf
    • http://musorcentrum.hu/files/article/file/tipavavufevizowubox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=name+boy+start+with+s
    • 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_off0000f0e0.bin
439641e9995762c414708f288909ed412080a4df79528ac79c602bc123c9a16c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10540 bytes
font_01_sfnt_off00010905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 16792 bytes
font_02_sfnt_off00012117.bin
7195f7a602f3cb7e83db823d789dc0ec53bbdc3f419fc92cf5cce52ec381e2e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 17600 bytes