Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6a311f8c2d2a6a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 17:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84c684d18c8594262de71ffdccbacf17 SHA-1: cc896f993104ede8660d177826849c9f5330f2ca SHA-256: ef6a311f8c2d2a6ab0dc929749c02d5e0bba6046414c75645b510be1ff60fdf7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to various websites, including those hosted on compromised CMS platforms. The presence of multiple links on potentially disposable or compromised hosting suggests an attempt to distribute phishing content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9bc2156668aea6d7df2b0a9f1ba152d1/96667031255.pdf In PDF document text
    • https://fishuntpesca.it/file/39604403091.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodal.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/sinimorumodapisok.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a0812a9ad909219a89553f3505df0a62/58595486542.pdfIn PDF document text
    • http://centrons.com/uploaded/file/167329275561364f50f14cc.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356e746a395---20326882641.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/48213423795.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60fc8b74d---44888338133.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/vajarabubip.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/banulovogalajutalojoguvox.pdfIn PDF document text
    • http://cartopack.be/Images/file/80386402227.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60502562768.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/78713460757.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/41688036335.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/levitumixuvatazixubexe.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/jogagewemonezuvagamelovul.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/gukufanipuvoribulov.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/balovubaxabevixuvod.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///boneporene.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/43942749887.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/wododefikunojovofukokunu.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/71373456786.pdfIn PDF document text
    • http://email-database.info/userfiles/file/1416264350.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/fexepugogetamaxovaw.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/xosuxugibasirapa.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/midizugevaxomowosasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=project+free+tv+dexterPDF 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_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 18232 bytes
SHA-256: 13aab42be2493a34b3017f313b4f4c06e5d4b4dc0af260212c7d9849395afdcc
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10196 bytes
SHA-256: 12d1556e80d8cad1be33d422b9cc35e3888c08e040901f201cf9a6248dd61907
font_02_sfnt_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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