Malicious PDF — malware analysis report

Static analysis result for SHA-256 197b3e95384f5b3d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 16:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 055b0ed2034ef2052e8b67b607238fc5 SHA-1: e723de5ffd6a3c6074cbc98b2979cbfd1bde214a SHA-256: 197b3e95384f5b3d129693ae79ccb1f934d55c10139b10982572a155c0f70bd2
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6144

Heuristics 5

  • 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
  • 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://himalayakebab.com/shipinc/userfiles/files/37881484373.pdf In PDF document text
    • http://soles2walk.com/data/file/zivivapibewe.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/widafili.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/84139891114.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/genapidetovudoxadefo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/48797201064.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/86760391915.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/73046249777.pdfIn PDF document text
    • http://aurora-c.jp/files/files/wexajuzi.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/wifutafomiri.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/petasogiri.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/pikizavufut.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/823c90cdc224e7a73729a8da5129733d/desizonuma.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/81075960383.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/tojamunekeka.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/zisikepujurufofetufi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c6f2fe0441933eab52006b3ccf9f84d0/bitedatezupezipi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/46728413729.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/74782206767.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109061408447610.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614958d8067ba---gebagukewimukugexajuwu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32657173125.pdfIn PDF document text
    • http://geotersrl.it/file/99429349112.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/mifibironapituj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=overwatch+live+wallpaper+androidPDF link annotation
    • 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 23300 bytes
SHA-256: 9d8081e8db9e801a5fd62a54efcb2c66a7b3e7b20e766c3a979bbbc76654b4b7
font_01_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 10620 bytes
SHA-256: e8d3c9f0168cdeb7fd45e8ea510128bd13d6f64ecc2aa08ae56fc3566c991e7c