Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806500094fb3c65…

MALICIOUS

PDF

66.7 KB Created: 2021-09-09 10:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82b2f3c980233b53c2cf112b4269db7a SHA-1: 1353e9dd2717c2c9051e9ed3f0a5db1b775259b5 SHA-256: 6806500094fb3c657643ef4d948815dcc79c93dcea14114a6ccff049c8c503e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3830

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=pokemon+sword+free+download+apk PDF link annotation
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wigoziturenagibulonudegin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6debf14---91009618863.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/63519321227.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/67276059519.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dibuzivipapix.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xexutumupejotowerago.pdfIn PDF document text
    • https://limsurempat.com/contents/files/dipurolugufedijel.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xubimikubebijabomof.pdfIn PDF document text
    • http://modero.vn/upload/files/demovizirubiparesabaxe.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dupejosuzo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/4799112512.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/rawutowazewilu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bekuzitozepasij.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dikenuv.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/54386317389.pdfIn PDF document text
    • https://x-software.cz/data/file/wodoxerifoxinizepujize.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/79301617608.pdfPDF link annotation
    • https://takipbizde.com/calisma2/files/uploads/xedukusubapulim.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/86ockv56fjrkpfkesdpfroggt3/87725605617.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/95023901219.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/benozibeviwebefo.pdfIn PDF document text
    • https://tadimtursu.com/image/files/voluvokewitozuso.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/kowuborenavewili.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136bba6cd7cc---37417747219.pdfIn 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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 15376 bytes
SHA-256: 79c7b7f7add9812fd3ca7b511a68e89b0eba85278d70884093c3aaa5c1e88f4d
font_01_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10648 bytes
SHA-256: 82d4283031f7ac434b32080f2b81927edd3d4bf5f364394abaf076fd43cd4d2d