Malicious PDF — malware analysis report

Static analysis result for SHA-256 228cd26dc633c1ca…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 21:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46cdaf8d2fbf545418ba5be7614187bb SHA-1: c5d85ced625e736cfa7e60cda6c90cb26cb397ed SHA-256: 228cd26dc633c1ca948476d6b8f64e3d2798775d60e782448ca0899d3b64a3b9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=local+area+network+and+wide+area+network+pdf PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/kosejokoxulemebosigupomu.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kokowuporamuwijimigitela.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/wipotevegidoberolimaputa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c141aea862b---tazibeti.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/89977497622.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/13424937643.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gawikefozufuniku.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/25996976261.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/najuvigufagikuserupir.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/dudogumuxatuxufelozopima.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/padesom.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/daxeragara.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/59561337343.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160875f93972c7---pirapij.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eb303bbd---mataj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58618549636.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/96848740511.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/79291575061.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4eed6c25---kutewasefufegujugomuvij.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/51210839777.pdfIn PDF document text
    • 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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 17320 bytes
SHA-256: 0603edcf47fa22a8c77ce04e7b7e4b9bb3a0986308d93c9a2370745bd63d0bc1
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10580 bytes
SHA-256: ed29f8494942880c2f73c03ed1e885576f192feb8732d9aa8f98ef91e9b0842f
font_02_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1