Malicious PDF — malware analysis report

Static analysis result for SHA-256 7756fb4bfff59267…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 10:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3533e40db31e37680e56a66a0b18bd1 SHA-1: bd5887d1f531cf1d2cd99ff05a6d98bea7670da1 SHA-256: 7756fb4bfff592677135ade9d28af1cd610e13932668aa963f24206f27f85ff3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.vikingmaterials.com/img/penifanitininuvagu.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a08b4b578---77176708784.pdf
    • http://deepakbatteries.com/uploads/file/nomefuzipokozejikodat.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4c6c7353---rarigaxolifenemefa.pdf
    • http://vimbark.sk/editor_uploads/files/60670263919.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0193a8781a338451081edc3221927766/365066727.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724d8d4177---4898689020.pdf
    • https://aldurra.ly/images-editeur/img/file/21461334806.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14028d6c5---zeluzod.pdf
    • https://cleaner.pl/userfiles/file/48716110477.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/53127496636.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b1f646297---kujeporifedawe.pdf
    • http://crescentcarpets.com/userfiles/file/kitegopusezeko.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/kubizukopekemutujekuw.pdf
    • http://dui-antidote.net/images/userfiles/file/nulukonebusavajalibukixe.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/loxewipujilevuj.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18355791478.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/radalow.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806587eb1ff---67828490492.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/risimuxiropaxomolusaxel.pdf
    • http://africa-emergence2019.com/userfiles/file/nofogug.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/572d5397657be0c5af8084f25c816ce1/lazanewajetiludevewotokil.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d1536cab---28938652681.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9df1e3c2---6672717857.pdf
    • https://webmenuplus.com/images/file/rojawelaxefirakexoxi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=general+quiz+questions+for+kids
    • 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_off0000eda8.bin
b454a949b343a2d5519765e3cc62d26cb1195c9e076c9ad60780d322c722329c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 17632 bytes
font_01_sfnt_off00011bbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16792 bytes
font_02_sfnt_off000133d5.bin
3b82ca1d191ceec0d19e4efa4aee14b28d5f3db49d026e1ddfcf570a36afc2d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 10784 bytes