Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a203f826711e659…

MALICIOUS

PDF

62.3 KB Created: 2021-09-08 12:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74ffb98868f6bd02abdee2ce4b2d213e SHA-1: d0830acae15326a26b9d6ffc67bfd68960633b84 SHA-256: 1a203f826711e659b35ce18255899288ab2dffeef26c40d4d74314ac8547677b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9069

Heuristics 5

  • 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
  • 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://jimsclub.net/new/board/img_tinfo/file/20210725182937.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/56562543580.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210627_6F966A25CD3C5851.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1625dea49af4d59b53478a9d7e92905/gotawo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ae1fa049479971fbc2fde79cbca6a7c4/muzuzeko.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kupunajinipa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754ef69435---21912031968.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/62aa41523c9c4604638293ad0feaf6da/zituxenozexenifanuboxufe.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/69379920707.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b2c92022---15079859505.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vitakegu.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/54262832091.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2feedf46---15338103890.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/44709729843.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e236d8d0d---nakolulimejedada.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/1961716689.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e7943021---pugokesuzitefenas.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/83774721660.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/emborvqq2spja0qorptk4e2lee/65751576371.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tanudivopi.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/xuladofifavasapenisina.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bd53caf59---26769077523.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/83078859431.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/zulipijaferadajunuxu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zejovabenotasegemajukan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=composition+guerre+froide+corrig%C3%A9+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 11040 bytes
SHA-256: 93ec957c4a474a9ef53b25ec91ab7f2eb325dfd13ba5eb38352508c952d4d8a8