Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee335afb84ae1ce8…

MALICIOUS

PDF

111.9 KB Created: 2021-06-25 22:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3196311b594215bca7bf787a7d72b339 SHA-1: 345b08d97cfb5cf4000feff64b1ae48f7b602cec SHA-256: ee335afb84ae1ce8c29239289e3bbd72283e39f4a1f856fa4d61c2d79757b016
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The presence of numerous links, many pointing to WordPress upload directories on various domains, suggests a link farm designed to host and distribute malicious payloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document attempts to trick the user into initiating a download, likely of a second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=cognitive+evaluation+theory+example
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f70a9cf459ceb42b325fab4eeb3d9aca/xowoparagogugu.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bf15ac750850c565e34ace613856552c/wenaremexixev.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/xajupukokurikisaninef.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/53e40e16a86cd37dffee501a662f06a5/69334146819.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236e05or2o3vvk3rdda50tsf95/55383302564.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8853u446pco7vjrgadmveukou5/gifelobegoxasexik.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a191e85d486---72820936270.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/68d435b0cf9102199ea3048a7bdbb582/dunoxosozasotilibupeze.pdf
    • http://udclassof1968.com/clients/74076/File/fuxelovuzuvoniliza.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9d260bfa059a64f48f1af22399177b4b/vakexixu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3bf5d3731f3df0e08601279ab085cee2/fabezelux.pdf
    • http://angelcabrera.com/FCKfiles/file/jijufakavukog.pdf
    • http://szabobuszrendeles.hu/files/files/vavagawugolononizabuso.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab605603---mogesusuk.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c34fc21ac17c0705122b8e17df62c0a9/40263521283.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27430dde5---tazafuvakutarodo.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebfca9241---mifegukokideviwiwadom.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b69248390---jonabewafirejurawuxizilun.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7870d4918c0b30ac37bd033e63ca6152/57225695911.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160848b040fc13---tafipurebokasisaken.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f5a662df---84382909886.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6a5ebe76---19480451144.pdf
    • http://alkanboya.com/files/file///nugejololakane.pdf
    • http://abpaluso.com/upload/file/teratepolutibisebebomemux.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3ti208i276a22j8f82bpjpcbv0/vumebadiwonogasomiduj.pdf
    • http://jarosi.hu/files/file/64958397645.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014566.bin
44d56dc830b084007a46e9058c06f98bf149eb81d0579739a8d536234969f4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 17844 bytes
font_01_sfnt_off000173bc.bin
0be2af13236ee21cae0cc5e662bd69457f646543b837afc02ffd4ff0a50549fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173BC 2972 bytes
font_02_sfnt_off00018005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18005 16792 bytes
font_03_sfnt_off0001981c.bin
b4b4c17478999ef54ea48c3e608b100ca8b9f6b5da06c023a282c9027a281bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1981C 10944 bytes

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