Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0f5358bc523342…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 04:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd1c28b1b781eff8700e7050ba241a7b SHA-1: 87656894a1a48610873020bdd54a724320ff1793 SHA-256: cd0f5358bc52334253644f4160d6f71f345bbcb34b7779a123de73bf8d5fd2ba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

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 http://nanobubblevietnam.com/uploads/userfiles/file/waronokelebirarudubulag.pdf In PDF document text
    • http://servmed.net/userfiles/file/netuwosibezakozara.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/lujuladabujelenapavuzedor.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30582791547.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/10173775943.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/mejowisumeketol.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/roporixokoginizuwejesoki.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/27634636063.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/19132555815.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_050012.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/76614401229.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/99186929216.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433a309a0f2---92714859670.pdfIn PDF document text
    • https://nistd.in/userfiles/file/38818420442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229651d2f9---soxeguruvab.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/39988186358.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/kejega.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/livolaxapow.pdfIn PDF document text
    • http://indemo.pl/Image/files/17495942924.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/85283968942.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/39332160019.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/vipagasalunodiwekorawap.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/14348085e3d55b47928bcd04c57414ef/18373545313.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7880240ab7dba1434156224392c1b974/5832407594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+contacts+after+factory+resetPDF 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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 10564 bytes
SHA-256: 0558d88eaeb674c8fe951e93517f73b2f66cbdbafcfd7833a346bfd5640ada1b
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16840 bytes
SHA-256: dcd51e2d39f121b5f0b337bf0dec656c328cec0f128abd1926716c817d81880f

Open this report in the interactive analyzer, or submit your own file for analysis.