Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da66c36a9ab1b8c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 12:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71b81f8a646be03588439851485a3c88 SHA-1: f7da0673863e064fffea0d8150deda3b35de2ec6 SHA-256: 2da66c36a9ab1b8cdf1ed4142148c2ae41b731cb7f940650cab0ac40d7d6dbfc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mi-stores.com/basketballtotaal/images/editor/file/julurawupugimagixibisa.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e2a4d0129---36251180051.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/rojuwizetagix.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/wubupipilipefisek.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/654203189613ff8e1eddba.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/toikq66mm1uid2thijv0ta2ate/suwinibavizumarirekemuk.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/33796468916.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36db23839---lefikamibuperufejerak.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/biwavupa.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/kusukobupid.pdfIn PDF document text
    • https://codecs.ro/images/file/40431505483.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/32663569720.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/laramuxalapapunubo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631505339.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/73722922699.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2bcea66e59ea2d40f731b36e2481904c/sobuduguzekegudi.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/falavanozofite.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/11339110402.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xomufotojajidodibejeza.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sh7lpe4ob5jb0nk3k5arnuh5lv/20942815889.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/22800063435.pdfIn PDF document text
    • http://freeski.hu/freeski/file/fuketanekog.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/79195433182.pdfIn PDF document text
    • http://intertribo.sk/files/ligekulilurafogimufaruwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=show+cursor+in+edittext+android+programmaticallyPDF 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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 17064 bytes
SHA-256: d6616bdd07d134af7c4ccbe9dea7a8aa7c9412cc04e8d8bbe823f74d992ca7b3
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11440 bytes
SHA-256: 99eb69ba59f75cb01cfcc5bdcf100a96fd8e26909a3032ebd43eb3fcccc7b3cd

Open this report in the interactive analyzer, or submit your own file for analysis.