Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f2fcafc89e854e…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 22:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ba70630930dee88ed0647178c9923a6 SHA-1: f66201886aebd6a03ef20f103dc048f383e9e0df SHA-256: 29f2fcafc89e854e1ad560625d726b3cfed2d86c1235d6e7128693b81219abe2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4785

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://chcial.ru/uplcv?utm_term=how+do+you+spell+who%27s PDF link annotation
    • https://karinbentum.nl/uploads/file/rizatukirasunexugol.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/kerofokide.pdfIn PDF document text
    • https://stotex.rs/files/51494524127.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/xidinife.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/47470879400.pdfIn PDF document text
    • https://dm288.rs/slicice/file/82477221014.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/11225890271.pdfIn PDF document text
    • http://centromp.it/userfiles/files/25331209858.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1a7d9e32---85875073954.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/963428564.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/jelexigotafazisulo.pdfIn PDF document text
    • http://pvvc.cz/files/72670916880.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///69160126177.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/pofidovub.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/bipirupikazixuvevo.pdfIn PDF document text
    • http://dubiliergarten.de/uploads/files/bupurivanasu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/99a4c484b60ebe8d77c94731c252b7e1/wiritub.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/79340303092.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9e74056fca8b499984ca525cdf7ccc1/5404879263.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/58001097149.pdfIn PDF document text
    • https://lesura.net/userfiles/file/92566996738.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/bivozesidov.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/nifipigemisevirutotu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/vaboro.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/48215801381.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/40186257455.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/82020336120.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10260 bytes
SHA-256: ec4e00f1c4e766dc7f20e3d45b64e25dc92c0909656bb900d13ab16ca933d961

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