Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0b83369b8fc7e9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 08:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67abb9102595f7d5ee406f525a7fa402 SHA-1: fc17569e244bd1d3687f76f9196bfb15aff45556 SHA-256: 9a0b83369b8fc7e950bf9a6881ab083f584ca1ff7685c6e7082aedb25ed06c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/fedidosibakerunuzisofun.pdf In PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32798427898.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gegod.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/83582332917.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0d8d43e66d98cdb499d3f9d31447a2c8/xelivevoveb.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k2crhqp1hj0b6q79tmbtj8jnl1/25550528686.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072824406ed7---8266940838.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/zizixijowomatezovu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wixulowoxiwe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c3e2af7dd77377e0836100a6f3631bc1/7972389026.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/wesujiduriranilesivi.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/52390912380.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/tarupafebobogupofupat.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/f4ovgkjhgdvr6p8catf1o9cg5s/46828922966.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kalunoselutaxonedirixir.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaaec47e5---80559702442.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/2par1qf3e6boflkoo49jh0qtg9/28508016566.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/57969980379.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/vojufug.pdfIn PDF document text
    • https://angkalaris.com/contents//files/judubogelavunozedetorajix.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/00c903e704ec93dce2280a62da0fb768/32926765268.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac780ea03---64613491056.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848543eafed---gokapanoziwu.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/7848203701.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/92759191414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lateral+area+of+rectangular+prism+worksheetPDF 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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 18588 bytes
SHA-256: bb20d16414e56d8c1730d0ddc1b90040c914074b3f392560ff04088d067e7f4a
font_01_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 11160 bytes
SHA-256: 849c45bbb9a905986d2cb0a8ab41bdbf3329f0af3420692f2ce6dd64f1d6d334