Malicious PDF — malware analysis report

Static analysis result for SHA-256 2757b195fc2ce48b…

MALICIOUS

PDF

95.9 KB Created: 2021-06-26 16:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8031b009d5cf1f66c378326347739c1e SHA-1: 72ce9667a4e588c0dd108e432560bd260e5e1ace SHA-256: 2757b195fc2ce48b8df15b725255f3d6bae0e4b5471954f5d56d528642446635
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The file's structure as a link farm suggests it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f1d74907---labanexejekeg.pdf In PDF document text
    • http://mytmbc.org/fckimage/file/43030611555.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/80589077999.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bda5fd3a10a3a62fa1b03815333e93c7/poduvituvepemorizofo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9bd881d17ab6cd5c1d3aca40aa2beaa/bexaso.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d635ac5f0---99181892030.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/642b395cd3cc07f984b141d8e390c848/64025583602.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f0201554---41867160803.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8ab8980b6---kutufuxoxifatilokufixili.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40103457363.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/423605c9ee57fe96f2f98c53e06121e8/vopadanaf.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3491379bdbd51aa487ab0902544a24b2/dodipe.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/nqoiaae73jqk23jmn09990n868/32955638323.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragajuvajurezux.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/emho67krroqrkksf74bg3bg4s1/67755111546.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942487096de---zeduniwadarubaj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ea00661c---muxojebokobuji.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/22376314927.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102832d8e2---38807238933.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/vavalijovodafabitaxiw.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e14dc678---dogevufedurimuzipabi.pdfIn PDF document text
    • http://aa-nusd.jp/wofilakizabikugu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nugc6fkpl98mqqmiqvem35e03f/20200855585.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/67571515654.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdfe2ee53d9b7784cbda1d4e07a646d2/xijapajefu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/77769655481.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff3763e62---41200294911.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4292784cafb61ff3447521bc80f1f727/80863258180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=west+north+westPDF 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_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 17256 bytes
SHA-256: 8f62c09be3eef01109c769cd150b27819b607262b6c13bc95fb5c952a7506424
font_02_sfnt_off00015bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFA 9984 bytes
SHA-256: ec04bfe3ce6f7002138326b33544dcd1622f0d218c3a7fbceed419c0e8471076