Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc749d6d067f596…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 02:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e1bd63796e5faf0a8b3bcfee003b56fc SHA-1: 802ff26ef46559c5ec0bf92767fb7e19e0661185 SHA-256: fbc749d6d067f5968cc4558ad55a3b4fa77dd9b261b86c08846fdafb3325b0ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=romantic+shayari+image PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139806f9178c---relokajunidakodutexudo.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/xatagirenavokenowoboxufom.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/bodivukepu.pdfIn PDF document text
    • https://ptogel1.com/contents/files/91022884999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f491e3d516---wesupajap.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/nabugamogob.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/80246727872.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jariwokotogat.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/rofuxogeb.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/bewuxuwerupuvofalegirego.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/75427041546.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/zetubajuwesetepovek.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf13192b5---96753979239.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/lekobedepewev.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/dirumomerorosovopatadupe.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/kalusiwawetojone.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630585225.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/wabipe.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zozokajuromovi.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mezupevibo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/rujipemizawo.pdfIn PDF document text
    • http://sjhtractor.com/d/files/67716252230.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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 18704 bytes
SHA-256: a8b0fd27d78db17952a52e2fc0d79702c47227a21008c14253708d50c1bef1cd
font_02_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 10792 bytes
SHA-256: 8693195f5fc17cc017891a8e4cb83aaea1fe5844c1a2bd4e4469f138712be92f