Malicious PDF — malware analysis report

Static analysis result for SHA-256 748cbc04ce0d9074…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c07e473fdac73795321419ca9434545 SHA-1: 25a57a0b81f487e04b823cd12217fd226dc2a3da SHA-256: 748cbc04ce0d907416402fc99770d9f57cd5f24173b70606a5ef170d457d61fd
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, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kuni.ro/app/webroot/files/userfiles/files/99604835655.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/bubokegax.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/70391451489.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132280ba9783---90868114568.pdfIn PDF document text
    • https://basisangka.com/contents/files/nijepeza.pdfIn PDF document text
    • http://asustainable.com/global/file/gupudojokedomov.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/de1ec52565ba8c89d5656028be92c92c/xuzulatozutedegegugo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31750fd5---jelifut.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xijod.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tulanekubajomuwazenozi.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/75989196067.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/bedimakijufagoxuxuwokuzem.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/mimuxevadize.pdfIn PDF document text
    • https://slide-bearing.com/d/files/71665171284.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/nikibekojopiranop.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/3447373581.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210901230845.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7fc3a7d96aaec050390a5098bc83e02b/73225843882.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/27547063256.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2f383f75c93a19dda3c974baf7c9124d/lafunedinasibodineluwoxez.pdfIn PDF document text
    • https://mimpishio.com/contents/files/1196256288.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/migex.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5cab6382acfdf0b3c3c2eea568de1fbc/89664600918.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wevor.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/zesumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=come+aggiornare+un+app+su+androidPDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10720 bytes
SHA-256: 56222b0d1f812e79e62dfffb68f7b77dcfa711c77493824d0f7ee8a6aed92b9f
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 17400 bytes
SHA-256: 96090a6828edd8ceecb664483252ee22dd786bbdad0bba64240af525ea42fc64