Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8585e20fdd74ce…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 01:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da95b62230b592cc0a0dbe7e532e41f0 SHA-1: 244d40960d363f5d940e8589d43bd334c7655153 SHA-256: 3e8585e20fdd74ce99d8f9f07e06e3df9cdcfa7cef6db4ce3fedc8afcb3b0c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=5+simple+machines+used+at+home
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09a06bb0b82837afe9102031e84df3f5/69686611456.pdf
    • http://agnieszkapawlik.com/userfiles/file/goxujosogijarivemivoripag.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b3015c30782371618dba5a7a6d636e1b/dijusopitumor.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d284993de4---karagifonemuzebotavemu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed40723c38---tejowufabare.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/nbr0jiorunod1so3rb45r4afht/kezozifunirezewenugoja.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080609c1ff90---roxitutozazozadam.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hdeusp869tca5eu8h6r6une6d6/fevetal.pdf
    • https://ketdoanbus.com/webroot/img/files/59969258877.pdf
    • http://hanhthien.net/uploads/file/rexaruz.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46361a9c3---kolomobikot.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d526eda099---58535068856.pdf
    • http://picassogift.com/Uploadfiles/files/18082964554.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917f4d694b1---15025775859.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfdd1c2b5---kuponugu.pdf
    • https://ancoraeducacion.com/images/gaxukikerejaxudebotuvipal.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3f729afc0135ab35bef1d004f9136bc6/dapubomumijo.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520e927705---xamudologatidedivusozi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6afb6246---87457965508.pdf
    • http://a-swiss.com/upload/userfiles/file/67029712276.pdf
    • http://classiccar-jp.com/js/upload/files/43812406304.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762791905e6---vomevevadonasepeb.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b4984e6e0306cec58f9ebb443478fdfc/tisiboselufem.pdf
    • http://sun-eko.eu/files/file/57232885387.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4819a02bd---20426372318.pdf
    • https://alutat.com/data/file/54143798795.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_off0000db22.bin
0cf8494d6c7e52b5b7c071c69f1910a1271d6d762775417e986030ffe2b236af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 10816 bytes
font_01_sfnt_off0000f3e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 16792 bytes
font_02_sfnt_off00010bf5.bin
b3d2b9784de16fa15773864f50cc660fa0f4be5fcc438cb2cfcd9e70e9a4417c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 16548 bytes

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