Malicious PDF — malware analysis report

Static analysis result for SHA-256 397b1cf4cf4a809a…

MALICIOUS

PDF

106.8 KB Created: 2021-06-29 05:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53e7f5c0a73630b0a5c4f479f548f46a SHA-1: 891de9f193d8c19129966667c8da28b0905eaeb7 SHA-256: 397b1cf4cf4a809aead01732ebaf7bbafd9bc9ca4b3be4ea36de8cffa4fd5b21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6283

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 https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861bed6cfd4---32490955750.pdf In PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/17536003334.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/1684518412.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/75907380513.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/97839093896.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/86741790390.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee83606d1---64554775804.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15bc77dbc---15154107682.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/73379688325.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cicmqi95iucucg06qvqhnhooc3/86612725228.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v1gjlr685q7u2im8nsvhrp6ilv/pefinatebefenotogikiwarux.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/66915428b41a8ed03f5ab8c1991bd1cf/39151054445.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/liwojovu.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/razenezarexizelilenaxek.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/joh4e6o3e7duiuh0eghb086193/tidizatuvexopoliz.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/79344312159.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10357740e6---jojet.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91493360d---fupavis.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9a4b9e51---61781158623.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/rebuvojosimofer.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30837a8c14---xunumuzugefekafo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609137be2d001---tuxorewoserunixad.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/95132948066.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/81653408992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=i+am+going+back+to+the+startPDF 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_off000181f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F8 10812 bytes
SHA-256: 282798ade230b3df1646dcc73f1b155f25c849ec31a87b158a544fc77bf12141

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