Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfcca192d49bdca…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 02:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 717edfcf16062b23a4421b8b49aa11a2 SHA-1: 7939f614658feab024b1bf5e0dd8fb54e28639ae SHA-256: 2cfcca192d49bdcae05e32ed9d0231fb53ddb3c9f25f712241e8c0f179c92f98
236 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a lure for remote support tools. The document's content strongly suggests a social engineering tactic to trick users into providing remote access, likely to deploy further malicious payloads or gain control of the system. The presence of embedded URLs and the nature of the heuristics point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support code/control handoff high SE_REMOTE_SUPPORT_CODE_LURE
    Document asks the user to share a remote-support code, connection ID, or allow control in the context of remote-access software
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.yemany.com/yemfiles/files/daxaxixigap.pdf In PDF document text
    • https://umutfm.com/resimler/files/wunezudirexigolivug.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614263a9a3e32---videgufugabigor.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fufudojogiwubamemutukodi.pdfIn PDF document text
    • http://ducnhua.com/upload/files/tifibamopejukususesike.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zujowewiko.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/85708702456.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/52584047782.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/fedapudopulifuwejux.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbd376568---61569473426.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/pubebatapib.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fipasorefobuzola.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rurorupajirazikixefo.pdfIn PDF document text
    • http://119pump.net/d/files/54113660450.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/32559203183.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/9740150106.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/75431989474.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614248f56d5ab---23580329775.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51887352757.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/12649191891.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79401676605.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/fujijinuwikovuladif.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fatosef.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/64628184036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+connect+airpods+to+an+android+devicePDF 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_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 18488 bytes
SHA-256: a345527f54b022b5b37bb8155105c7e9601b641bd7761cddae2b01b1d794d373
font_01_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 10604 bytes
SHA-256: 8555170b47e1ff75230dadc4b6262b0487a90611d74876cbfcaa26ca3193237b
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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