Malicious PDF — malware analysis report

Static analysis result for SHA-256 e937ca45fde6ceaa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cddc97e54dba856ecae2f7fab57db7c6 SHA-1: c6bae83a4007806f16520bb2667a0584e0459277 SHA-256: e937ca45fde6ceaa0096e6aac26fa05d1d7347ddb570c2e6d0f64b8617bbf64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://progettogeometra.it/userfiles/files/rigebelutegixini.pdf In PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/robup.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912230659510557aspesbg3o1xg.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140764401b15---sekafejamowaf.pdfIn PDF document text
    • https://trexanh.net/upload/files/79171895211.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nenikabusamabagofe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7890a181---nadevoreradawibezovikoxu.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/44f45cefdbab3a6835b48fb008db6975/79561374822.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/64934487534.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/28618656266.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/18902904914.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/73615923337.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/2656080891.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/57581848292.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210915173008.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8c4cbc969ecd967d9ebaf7218c276fd2/gakukukenopopuja.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9de1ab36---judilogisimagaga.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/eeaa154dfc097f818e69688b88117752/farokalekipuvededaku.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2e4f64614b346360d075a1ded48bd9f8/26395257157.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210912101651.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090516244373499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=american+republic+textbook+answer+key+pdfPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210913/16315017817748.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 11396 bytes
SHA-256: 58c88c7f4b3a3370aee0785a17c2f393b0dfed22dd9de880958f9b8d34a15d37
font_01_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 17832 bytes
SHA-256: f2fecda2c1bbc76711bd9f5fef72cf12bd6bcf4ef3b8533412770c67bc6a80d3