Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45e7bd14f156e95…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 15:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e04ae697766776a3d28d53126bd0722 SHA-1: edfc89690b65b8797567513703cd76994dd09a19 SHA-256: c45e7bd14f156e95e91215ed4a612a8b43eb13a3aeeb945f7acc76e94d4c5119
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also functions as a link farm, pointing to multiple unknown URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1482

Heuristics 6

  • 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
  • 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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161216b05e28df---nanakonudopunazamil.pdf In PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/89382978977.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/38387260554.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/65324540514.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f632iuucqngj4lme4sdids37ha/63653155134.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/041049265124.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jumugiker.pdfIn PDF document text
    • https://fasaac.org/temp//files/dazipixodeniliruw.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b1e04c73---58305911587.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/xagunigotazapeli.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e66a50ce3---gumanofupadinetipawuka.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/jakisutipud.pdfIn PDF document text
    • https://path.mn/userfiles/files/didujivebibi.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/nodafawikegaponomenemaviw.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fonil.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/78334284056.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/lutidavadigo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf6ef2d3c8---45075594740.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/65730945336.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sekusunekujo.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/regowixupojem.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a53be8fad7b34e8a496fb80a12e9ec2a/jozufidomu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/13920656329.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/47477083942.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f981bac61---fapajida.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421503894a---vomomabemivuwo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/62020266391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pericardial+effusion+pathophysiology+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 11116 bytes
SHA-256: 943d33cfaa38c7014889f1fface26dba355a985c24d4c6e63551199bec3ac46f
font_01_sfnt_off00012f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 20324 bytes
SHA-256: be16b68b17d1e09c35b1fb108cbbe99d590fee8ecb3ffe59391cd4bd3b63a6a8