Malicious PDF — malware analysis report

Static analysis result for SHA-256 245befc20d3eb9de…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 09:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cf925f3f63008e91dab23105777c5e6 SHA-1: 57d251d6f475c1538407a6de58a0923813804b36 SHA-256: 245befc20d3eb9deb3467fe1b503d046361d902828d2e01c798fbaff1b97f66b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=chevy+s10+manual+transmission+removal PDF link annotation
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160823fd56799b---reviketa.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bukukonitukiguto.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/18072416155.pdfIn PDF document text
    • http://naviway.su/upload/files/litivinufozuminarumususa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f08de3de5---zonotemekujumujosin.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/sunudotowediso.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/degokununoresigaro.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/33367481114.pdfIn PDF document text
    • https://akemi.ro/hirek/file/rozazapasibarulikukoxox.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03535cac7d47609df90117dfcb309422/dawow.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/ridatemiwodo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwajetobesigonuka.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/30400863228.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/jigepadifebosufitofe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aed4021ae---vikogekusorepuvum.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/17372002773.pdfIn PDF document text
    • https://o-dance.com/upload/files/towamovojaxavutoluf.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725117e0c3---kodikozoto.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/totija.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/48066740680.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/18637642997.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/97337246634.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/savilopugabegerit.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/919b0fbdadf855ce232537c2e6d526e2/xukojatuwiduke.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7065e557---88466759809.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10856 bytes
SHA-256: 5ab1ac0d4da11fce37960f9a74add40b72f3a96d897d24fe1b9560d95eaee8fb
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16076 bytes
SHA-256: 5b707012ea1697f3172402bfe9cac351b4dc514eed3bef81a2dbe9773ae22e42
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1