Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce272531a86e994…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 19:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628b4f36062946c601e15910869c6349 SHA-1: 29daaf90268c21c348a9d17a68c6df5f02e114b5 SHA-256: 3ce272531a86e9943ef1e1d11c271b622fadf9f2ea2d1f2bb6944058d3502ef2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised domains and the structure of the links suggest a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df12ba0580---56340713719.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f9614c8bf---65288038638.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9k53vmacfroidcgae9n5fvcmu3/86832149390.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de1472235---jadubikitokukibafuzu.pdf
    • https://emilline.dk/ckfinder/userfiles/files/98279140441.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bfep31q3uk99e1i4g51d2ubfjk/8527733.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832bc8b2c3---ranigot.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085adc54f6dd---60124852108.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d71b0293---84531908912.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/14349184408.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/k7f23eevi8n19khbmgcaf1ttqg/manikuvojepemot.pdf
    • http://scandirent-new.ru/uploads/assets/file/xuzexuxebaj.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b6a0db8f---65841341767.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bi29o2ot9lopbavs6offpfhpc5/17979612831.pdf
    • http://fixafilm.se/userfiles/file/sajizoberifituni.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/340eaac0c9692f3d6940d77ae4aa75c0/bogepubagixovamanigesif.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f11a3c8f3d---37085305862.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ccb21052---90117761621.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a29914293---juvom.pdf
    • https://cesiedizioni.com/userfiles/file/68548836953.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/81e02d6bf6ace20b06c2e4595a701a05/21323852022.pdf
    • https://vipbeachhouse.com/uploads/editor/file/76180743992.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f35c589b6---ditinoworitotuj.pdf
    • http://thesprotia.gr/uploads/file/98768843159.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ce559fb9---5294992649.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20b0d0fff---retinifuxefafabudi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=comic+book+template+free+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48ae55d247---wasazadafufasixodabe.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_off0000eb3b.bin
752c59e0dca141bd78537d16ffff11b019b7227a56f70c8b4bfac75460044df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17440 bytes
font_01_sfnt_off00011845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes
font_02_sfnt_off0001305c.bin
9131c6ae1396c06c877b3cff8c7630aefa056fd80eb66227b2e1253d43c5009f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 10960 bytes

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