Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f46f7ab50028729…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 18:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa74148063e32174f4a8a46b680bee7a SHA-1: 8c74acf4060e26f99e98d64bda36daf0824b98e1 SHA-256: 6f46f7ab500287294c7d012812cde301a2fda4b74ae4f6723a30417b6cda1d2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, resources.

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://santchavarabed.in/ckfinder/userfiles/files/limuxogogo.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/39850655177.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132b9b368---bipix.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/5939365114.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/pobelaximovutuvasudikoxi.pdfIn PDF document text
    • https://maturana.cl/upload/file/nulewilosurigedetujuwub.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/kusutudulogexuzawunolot.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161443a41ca49d---faxazepexidix.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903205939.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nozakotu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/waxaduxateviduzobububizad.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/10582027641.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/47418053924.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/76436576378.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_143939.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225e48deed---xadupa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133990c6bd71---44595821756.pdfIn PDF document text
    • https://rippa.pt/files/file/jipepezekekuzolarumituwum.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/31924411880.pdfIn PDF document text
    • http://nova-auto.com/upload/vebiraxabikabipigikef.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/27129951486.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25746609---depavewibojozafov.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/palirilarikeg.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/disazakedenoxowizewaxalap.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gofusiwozev.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/8803753986.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/37583356687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=john+wick+3+movie+free+downloadPDF 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_off0000c37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 10880 bytes
SHA-256: b5866ab23c19a04869527812f17f76ae26d62beaf7ec26757f924ca8aac9ee89
font_01_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 17384 bytes
SHA-256: c7eeace321e35617862510ceab7582fa3219eb20d18c1eda7bcc30fb39d0af11