Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa83a8232162f7ff…

MALICIOUS

PDF

78.2 KB Created: 2021-07-19 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13207ee41d09fa929683ded75504f83f SHA-1: a9befb94386824ba64448584b497099263421988 SHA-256: fa83a8232162f7ff25d77e730e634b1bfa9370230609f7ebbe305690e2bfb57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/tuvejutaxalavaxavukubawun.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25b6bc0a6---rudaxijotiwuvojaxa.pdf
    • https://securitegenerale.tn/userfiles/file/vevufebutigapuvajoxow.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8kkrrolbk68sakovlgu4mh864i/62517281360.pdf
    • http://www.hon-ro.hu/userfiles/files/miluredinikijemopuzibubi.pdf
    • http://deurenhanger.nl/userfiles/file/zixedi.pdf
    • https://gmnavarra.es/ckeditor/files/1282895838.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8df90f753---91377330495.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/b7ci6e2150fm75ftsbsagrg066/12174369298.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b133e3b627d---tesivuworuxaren.pdf
    • https://silky.ae/images/bulk_images/files/81546794464.pdf
    • http://thaide.org/userfiles/file/vuwakolirij.pdf
    • http://broorybulldogs.com/clients/33993/File/81156452792.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/72cd6ff284fc158089dd5d76ab59fa47/wofumojokajar.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/pazumateluduxofix.pdf
    • https://kudamatsu.org/userfiles/file/savegelebabudo.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/4dqilsugs6v5l1350m3nbiela2/61910357701.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/98a33803b31d73b7b8943ab2fac6be1a/wematomezebufo.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/4508389680.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e876c76953---fuxevugojixalibutunilo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b31a5235---ligusupojuwora.pdf
    • http://alituncer.com/userfiles/file/dixulagu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=snakes+and+ladders+excel+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16792 bytes
font_01_sfnt_off0000e664.bin
64590667e86831c238f4d3305a093414f447540084035c5a67d7fd8188186ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 17352 bytes
font_02_sfnt_off00011378.bin
4afcdc439908a06e0f2c3e582062afdf8cb26dfddbee37a536c5813963ef4e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 10528 bytes