Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca1e9c994683db2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 04:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6571cbe92f276b6fa845410a85e4816 SHA-1: 2dbd270b24c2b26158ee21176cf6379d556e9569 SHA-256: 8ca1e9c994683db2d31abc6c083c3c528c4721b074078a1aa70829962773f69f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sahodayabbsr.com/test/fckeditor/file/vuxexuwoda.pdf In PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/fulafurojisegudebakelavuf.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/1917314259.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/coq4atot4g8djdomvn58qconr7/xaninu.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/78513884274.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xemibegitikazu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/81288479817.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d624754b8b---tulafudafegutifid.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451b060898b---97766802711.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/bodadajifetugomezatower.pdfIn PDF document text
    • https://begili.com/uploads/image/files/lilomug.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0676ac892---vuwijil.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/89996142135.pdfIn PDF document text
    • http://twilaw.com/files/files/pinebetegekumit.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/1641033513.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/73548154096.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/fukarusalajijovepe.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/kenidijesevimoripowun.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vaxazofobobalegudum.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/3486154801.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/sizisupemuwenuvujeg.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/5460461648.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/87195648531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=poco+x3+call+problemPDF 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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 16884 bytes
SHA-256: 2b3d6899faab7656a6bcf9aed678d599e947be37a32ae3838cb11ad1d224161f
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 10488 bytes
SHA-256: 1c6c9cf418dca0f1a0ccb7325d92a629e2f8ccf9076f375946fabe41a352aea9
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1