Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf845e56e7b6512…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4103935ddd2285d4e1ee4e775b06dd SHA-1: adb5f755e1b4384e1f9ad8d2c5a21ca14d0ec74a SHA-256: 1cf845e56e7b6512f3f0cc0de3cb15917f150ea113d81a0d1f5d1ec86513ea37
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=where+can+i+watch+split
    • http://pololanna.com/user_img/files/21057146783.pdf
    • http://fixafilm.se/userfiles/file/66997163667.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/74949577742.pdf
    • http://nationalcoopadvisors.com/userfiles/files/25705727911.pdf
    • http://adabaskimerkezi.com/upload/file/fadifulijezazekojaxo.pdf
    • http://fmmvn.net/userfiles/files/luxep.pdf
    • http://collectifff.be/imgdb/accueil/files/97247184785.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346fd649d44---sozenebogofobaw.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/fazuxodo.pdf
    • http://jiehuist.com/userfiles/files/todibolivabo.pdf
    • https://projektovanje.info/userfiles/file/80230852345.pdf
    • https://zhavezbozi.cz/data/file/kutibexusatizigov.pdf
    • https://istanajp.net/contents/files/99298859423.pdf
    • https://malinaionescu.ro/userfiles/file/79315333474.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f882a082a---74272438540.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7b66322d---nudegadawixikepaluniw.pdf
    • https://lose-weight.tw/upload/files/76549613923.pdf
    • http://sarkar.ie/userfiles/file/xiwixuxikuxepavixudemoko.pdf
    • http://101-games.ru/images/uploads/files/5713634843.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/35851498980.pdf
    • http://chip-chup.hu/upload/file/53393572469.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bibizasek.pdf
    • http://timebymtm.com/upload/files/gowibezixowadowox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2f.bin
0335062a3ef221df7be735b431dce8eb3f294535423963a43e42fdbfd9ae6be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 17384 bytes
font_01_sfnt_off000107e1.bin
fe371c3f8ee30087706b29db7c13bec323dc04e1a72ac03eb49f9279c3effd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 10428 bytes
font_02_sfnt_off00011f86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes

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