Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff32a4128c389519…

MALICIOUS

PDF

67.6 KB Created: 2021-09-24 15:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 028a9c4719c5afaefec8e8ca0b7606a8 SHA-1: 81143620d25e77019764653e1e62a94b0b5aa65d SHA-256: ff32a4128c3895199618504b472e67d2cf57e713adf14ebf7356a30856ac1b16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gaestehaus-am-erlkoenig.de/img/editor/file/revibawepager.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/1684209445.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0100a6e5---tawopaxijobimi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/jomadumasopoxapurekajag.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/76119376580.pdfIn PDF document text
    • http://grabnerestriche.at/pajune.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/rebufubuxiju.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488d42965b2---47034886928.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/81629368375.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/22829088499.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/wadumobufarelirimi.pdfIn PDF document text
    • http://vizcsap.hu/files/file/fexazunusawuneka.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/toxaxetabadewo.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/68672170255.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/d1u07honk96jrb4gnvhqcktka3/71439531895.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146bea2c16ec---74769013494.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/59274269915.pdfIn PDF document text
    • http://christopherdallo.com/file/43019478418.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/nafagukuloxebuta.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/puwexuxajajajibilide.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/fenilisofapil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=old+kodi+buildsPDF link annotation
    • 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_off0000abc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC9 15704 bytes
SHA-256: cebd4b164b0f0695a416c589dff60490ab3ea8ba9c1716320bb964aba0e4606a
font_01_sfnt_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 10000 bytes
SHA-256: d9178460e6477380eac0e82539a45091c1213f309dcf4ecd662535e647f9bd39
font_02_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1