Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923c9fc1ea5dca3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23625eea01fbcbf165c8e5070ca0e457 SHA-1: b8658c970166cafd4b9901c75e0ff727128c1ce1 SHA-256: 6923c9fc1ea5dca30c8b391ab0880b6c2bb965003e3b21091e98c94df977549a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous disposable domains and compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://brkvinc.com/userfiles/file/93127945557.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/64389363147.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f73318f26d59044ea9d35792b0ccb9e1.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/35320931049.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/dugonusufuvesigawinax.pdfIn PDF document text
    • https://ptogel1.com/contents/files/77048798063.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/44313651329.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/15878652522.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea6a34287---83585202256.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091303002773499.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109090127536527.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/nosiliwidololuronabomag.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/47331715750.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/xelonuwepovapativupa.pdfIn PDF document text
    • http://vladekoservis.ru/files/zasizakikobupixigapa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c09a49770456947d378070f947ccfb49/leweledixusuvidilu.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/relotopivubedod.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/67948424065.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/66341786948.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/parajakunapolawumutekeg.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/74114558500.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161387d367b5b9---96056738929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+files+from+android+to+pc+using+usb+cablePDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 11168 bytes
SHA-256: b929da149bc89e6c4e44541f04f9ae253aa9b0825026708685b9c1d80f0c0aec
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 17380 bytes
SHA-256: bda284dc0eb96d5ee7ac7f3fb96746026ef490791707862e5ac5fe7df5fab7c9
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1