Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4ab8d008bd990c…

MALICIOUS

PDF

61.1 KB Created: 2021-10-17 17:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7724f4328c61c355552b3f75129aa20e SHA-1: 1a5afbeb083ffce6f84b2399f0094dc67f8034a3 SHA-256: 7a4ab8d008bd990c4deacf9d69b5b1bb67ab1d13da7d868b4ac734a7c3765516
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which are identified as compromised WordPress upload storage or disposable hosting. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://massarentearchitettura.com/userfiles/files/52107645098.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7lb69bj9josna8uteuk6cm495g/lenaluxovuxibetup.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zexopatubogekezuj.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/19489507486.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/58743680219.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9icaude3ilq2ool6gonm797m14/gekibepufepo.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/garimapegik.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428889ef101---26958521111.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zebolefakax.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142a7656a7e4---manosip.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/87116313849.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/20889319204.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/pariruwelabegevadutif.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/xafafodiso.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/gikopazidudiwefapi.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/dupefumemosadoxujil.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/xubenal.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/35408300408.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d044ee9f06---88778149181.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nd4ue6nr2l518clt76ttd9vg2u/32152835914.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/dokozobin.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=increased+peristalsis+of+the+bowel+results+inPDF link annotation
    • 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 10996 bytes
SHA-256: f0360d73aadf74a405716c0ff8a17f6a30c2dc85fd1afb30684a617c6e9381cb

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