Malicious PDF — malware analysis report

Static analysis result for SHA-256 256f59c9a5e6c8ec…

MALICIOUS

PDF

94.3 KB Created: 2021-09-11 19:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d21b2e6b901879dfbdc99f869b6b561d SHA-1: 104a6e2e12c801f15f9334567973d7be0090998c SHA-256: 256f59c9a5e6c8ecb7de9a4ea6e2f77668b36bb022252b0dc507325020498797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/21c571a03ccd6faeb9e61836ef91f954/kosefojuturefevu.pdf In PDF document text
    • http://oskarmak.com/userfiles/file/136880054.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/39080865717.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf2ab6998---54070614264.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zuwowo.pdfIn PDF document text
    • http://tfforming.ru/d/files/10202116006.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/69085095596.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/lopepapi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a9fe2bd8---kisusabu.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/21270186845.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/37180182479.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/kagolimafizamovepow.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/71001639475.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/88503927661.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/32983810014.pdfIn PDF document text
    • https://ysh.my/userfiles/file/92913160507.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/52924681727.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/torejiremuwediku.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907100252.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/50448929182.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_178D4CF06C92078A.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021952329584160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=book+week+craftPDF 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_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 18148 bytes
SHA-256: b704bd6867dc82d1aad38189e1644d1b27cfab85274d3f0de4679c64ba3261cb
font_01_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 10152 bytes
SHA-256: e7546ff96df0111885173e8087d754d07278ca5d006c4575847add95b754510f
font_02_sfnt_off0001539c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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