Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fb280856a8a7a4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 09:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9c66af097952d2386c3f3832c52aee4 SHA-1: 41ed9c4139723683e094754b5bae2c8bc7261c44 SHA-256: e6fb280856a8a7a4ec6f3966c5c97ef72108ec7b900ce81516670cf7dbbb4c78
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading further malicious content. Embedded JavaScript was also detected, which could be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1736ba898c---divex.pdf
    • http://designpavelzapletal.cz/files/file/48461618892.pdf
    • https://srilangkapools.com/contents//files/25184029710.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d5331f928c67ff60090556567a1521b2/56120828052.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/17382156936.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ek1knk2ti3pfakjqnfu6v8uccs/bitopowamorifote.pdf
    • http://robalton.es/Albums/images/file///30728345477.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/57180646550.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/nisesukaperoguze.pdf
    • https://mysmartedu.com/uploadimages/files/vojuna.pdf
    • https://adasms.fr/userfiles/file/bupewewuvofem.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0179d3ff1---kinimekok.pdf
    • http://ya-ke.cn/admin/upload/texuliso.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083273967f88---jegukuvidapawefekexizev.pdf
    • http://fujavietnam.com/images/Download/21739073675.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677b80304d---73861686922.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/743d808b00c9a5223d00ba9986d0880b/xepased.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6f721fc7a799bcfe1020d83bc1807217/57069038768.pdf
    • http://rencontres-icare.org/userfiles/file/tovesoboda.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/87021d9cc11377d320cdc3c0d07b5fa2/momutovabetijowutoralenu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d587d634f0---nizafibuju.pdf
    • http://bumsnab.ru/uploads/files/57146046319.pdf
    • https://chmelo.hu/sites/default/files/file/13551164567.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b455244681c---72152677707.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=english+for+clat
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ca15040b6c7f61cac57cb740c47e9de/foduvasuper.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_off0000ebe3.bin
9dcb766ed5d65368ffdee0f52878a6a34be7778d326416f93033b5a447a288b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 10464 bytes
font_01_sfnt_off0001038b.bin
e88cb50be0323c7f63703d4cef918df730c30da92a86e93d06bd226be8f3f64f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16796 bytes
font_02_sfnt_off00012f5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 16792 bytes