Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7117d9c34ba9a7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 01:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c302e72161a6635c3e376818c469ebc SHA-1: ccc110c57fe60cf0f5b0bc279698119cc15dc376 SHA-256: 2f7117d9c34ba9a7b5489f5b0c5dba528f952dbb92deec9fa1e99dc9d36e15da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=gb+instagram+apk+latest PDF link annotation
    • http://lamardaegu.com/upfile/user/file/gobaremerubeguzazuwudewi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wosejasimokatan.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161356b77cf9f7---kevofarixe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357aca81eb2---sasujel.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2968b724---45212673094.pdfIn PDF document text
    • http://carbonelite.ru/file/2692774206.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/vibabokisadasidizetipu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tojitumipeji.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/13796446083.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/21024847986.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/junesuvo.pdfIn PDF document text
    • http://tcihk.com/userfiles/vobunewi.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/84195663648.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pidofuvu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/11903260763.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/489755003.pdfIn PDF document text
    • http://imbirimbir.ru/files/buduvu.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/60960010731.pdfIn PDF document text
    • https://teamcode.net/upload/files/xeginuboliropozurif.pdfIn PDF document text
    • http://klenderbio.com/upload/files/78553673552.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330f244903a---kukejixitavadunegi.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tigafib.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vukipoxutonexexu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/patufaliber.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/10720510420.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10748 bytes
SHA-256: 1c61a9dc87aa29d11be381047f5a04ce42f5a5f5c30ae3dbb1e0511d3e17ed85
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 17052 bytes
SHA-256: df5e0f394235b967ed98809fef1c9ddcd81aed308915044400fb9868f69a12df
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1