Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cbc5699a9dd719…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdde897214be687abbf1c684ecd10ed4 SHA-1: 5c194e4f4e4ea2b56ce65068a97c75548aa410d1 SHA-256: 20cbc5699a9dd7191b7d4e9adba6856869e31ac77c0b46a173d5b70180469ff3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings indicate it is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adamex.ukrkarta.ua/fckeditor/userfiles/file/kimifixuvodapul.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/dijexuxejix.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26860802769.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/55607419840.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/81338823107.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/bujirakiveguxixakoluxum.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4bab3b3fb1942c9ab49c85559c8cdd15/lazibibemoviregevuvimu.pdfIn PDF document text
    • http://vina2002.com/uploads/files/75786475459.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/82863608220.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wisufafetudiba.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210909195057.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/luxifoxugiti.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/46101978836.pdfIn PDF document text
    • http://handgun.ee/media/file/walep.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109032156524454.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/sijiduzuduwo.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/vebomomoruleluzezav.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/29193659210.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dunorapujuwamukilemi.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912093219.pdfIn PDF document text
    • http://partnercable.com/files/56544649981.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4906cd1bf---volenixemek.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/denilitubufogilekupo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09a53e060---fazaxubuvoranexuxavaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+can+you+keep+chicken+breast+frozenPDF 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_off0000c5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 17880 bytes
SHA-256: 5598af3b34a166993a020af3af3150c96532c990e204856f21f7df6fe11f7a81
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 11340 bytes
SHA-256: e4981e3b8446f827553945353e6e93c2bbb395c42cb92743b635cede9223c62f
font_02_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1