Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aeecf21148f0f4…

MALICIOUS

PDF

99.8 KB Created: 2021-06-30 03:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c96900bf01318ef2d79d0c129a2ac72 SHA-1: 3c7ebc4bd0659ea27cf26bdf90c132a129fcf655 SHA-256: 66aeecf21148f0f4e17d642bafd1c150b6766e4db93c0f1c15e9db7f8cbec825
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 websites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable binary data, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098325c68a5f---39064667643.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e34a85655cd4085e99bd29beac11d8bf/90148952748.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01c92fdf3---95874645837.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58396ff23---vutadunijoveniwijuzetudeb.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/j9m9t6vh973dfn2jauouiq8bh1/11448299913.pdf
    • http://dtcguild.org/clients/80367/File/rivibamavivoret.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0aqt6cooqs98i0o649q0b5d1n6/356453914.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0cabb479---1308979553.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607073ba42e51---87867585931.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b64c22f8---kapabujak.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086936cee399---munadabigogotevu.pdf
    • https://tonitomov.com/picture/file/6316343319.pdf
    • https://chpcentre.com/files/file/tefub.pdf
    • http://interel-rus.ru/test/sites/default/files/file/mevozitimavemefon.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a84796a71ed---53261543514.pdf
    • https://lawina-radom.pl/files/file/55049522552.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075768b5138d---sipobufuferujugawitaza.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/29795535814.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/deh6cqa8g6ev1vg1qrm6790bkr/sutoza.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160761b8e20aa7---zitapapadirugege.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b7dbc98517a20257ea1b9280b7a1413c/30345625665.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/supibazexefukelugad.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807edaa964c---judugezotaselu.pdf
    • https://rotterdampools.com/contents//files/20027382011.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=its+friday+then+remix
    • 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_off00011881.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
font_01_sfnt_off00013098.bin
74e7fcf61a9f2cfe0d0c167502984f56caa56b31c058739de69ba3db51172b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10620 bytes
font_02_sfnt_off000148af.bin
ff8a3e94e38e86b32c8c13ca47c0e3ca0d428757c19c23eba74ea7ffcf34d7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148AF 22228 bytes

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