Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cb48b314358a49…

MALICIOUS

PDF

84.0 KB Created: 2021-07-05 02:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ed353f44beaaba4757840ed0ea253ce SHA-1: 4b257c220b00ee0463a3dd26e5596b3514050092 SHA-256: 56cb48b314358a49976fba827f8bb0de29315947918b6cba568ff400e98ccaf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://slesnick.net/userfiles/files/85525462701.pdf In PDF document text
    • http://barcabianca.eu/upload/file/74760404966.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/nonapur.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c287f136823858252f9f22ef6b51472e/nosivukoselewekoxuwetuv.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/vukixewuxik.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9vusm5qfcoesk0ibihfhhh5f45/redininatanuta.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/dc353f02babb95eaecb394aaa8454960/76970651183.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079337b057ae---wuzuponomuwefuduzavomaduj.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c150c1b364e382533c52f0acd1d48493/kavudemat.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7a444899---sunok.pdfIn PDF document text
    • http://ecole.ru/text/images/file/29417792300.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e7b6dbc655e51033eb6021c756ef6439/5441185905.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bf20f5a3b936ccfb43d5d0e38735c8d2/41907081537.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/138ad55f5195b9b32cad0a95efd6ff72/99418170686.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/66645248587.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/79620075600.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e3d414a4f5228215ba54a75d8e559e7f/duvazajoredevivasulujabe.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/kofupupigasigenu.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bae08849c---bilivisedorogupisekot.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/zojigatamawufapuwu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/gimabuletonu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d1f14eba256f6bd3e7d05102adf3463/vekulamifuwadeg.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1d94a678---zuliko.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/buritani.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/51461618538.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896471cf6c---titifukexazavubomenuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cherry+wine+hozier+meaningPDF 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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 17084 bytes
SHA-256: 144dc2b035719feb551431bc8cab510e7241836973bd7a99ad7c751554a9b1dc
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10532 bytes
SHA-256: bc41f526664ebabad1803bd82f62c6a6fe84edbeb41e3a55748f542548823695
font_02_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1