Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5de5d4e11ec10d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d77f78d78cc3f5ac388874c5571058f0 SHA-1: 71792b2dbf903a24c0af7a536ac1ad9b3e43e2a9 SHA-256: ce5de5d4e11ec10de6c34da52627c88a3784716b7edb332a3fa6142e92bd99c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of external URIs and link farms suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=what+is+havoc+os PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba77ac632e---timavolomowu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161303053739ce---49161537674.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/3546388326.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/34249051712.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fowowijovodega.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d897f2a67---25628541997.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/rugunisitof.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/65891352336.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142243a25752---21135240752.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/kafanejatabatunog.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/3859315707.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e08e5bc6c6335bcb4c4e8cde488156e3/91335269575.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/pazuluberajenof.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/7323503421.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/ruvowowazovajum.pdfIn PDF document text
    • http://erdbau-rauch.at/20702591997.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82384157386.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/liriwitixoduxoz.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/16792436153.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/22922964451.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/zulakibok.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/73958779994.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904162725.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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 17860 bytes
SHA-256: b0e8e950348d899ed283b85f1d75900e0783264ae0971a7439cd319403ff1a4b
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10004 bytes
SHA-256: d5eb2d31ac462db8edd33ba6efc16e5711e4f4d6935dd8b356e66e619ab20a7b
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1