Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf39df585e5f9d9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-29 05:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72d3e6c0a9c81991a36c040fd1752698 SHA-1: 606917c2a1fd354ed4888178946f1e23a1546784 SHA-256: dcf39df585e5f9d945ed674ee781871f0dfb58cd7759bea0a93e8ad81c6cfe33
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=saint+xavier+church PDF link annotation
    • http://c-six.it/userfiles/files/37906780976.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/88014755743.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/kuzogoximurowe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0b477f2d9---bezud.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/39946612939.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8711c3b5---wilalepojawalolodo.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/53685349128.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/46824237866.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ae47059b9---6206052315.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd3824d6---gavokudubozorunafebofo.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109051206591990.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69730098239.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fia55ttdqug45kuojmgv7urtdv/13232342168.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/ruruwetas.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/20617416178.pdfIn PDF document text
    • https://tpk-m.ru/files/file/gagabazibim.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/pazopuwozoxarenujikep.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3ffadf5b0---fotixexokalibeboxomorupe.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wisometujolulajan.pdfIn PDF document text
    • http://tcihk.com/userfiles/89756414291.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/43697827644.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/60824423498.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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 20944 bytes
SHA-256: be666a3ed27ac6c0dc5e2a00c78f288d28b240033d2fe0b86abee4b983df841e
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 10336 bytes
SHA-256: 9c598e70d618e42486e2b32fc7079450ac61838ea61d44150641a98e7a9f775c