Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ce89d15b71d78…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 544cc8075d1d30ea948549fb50d3433b SHA-1: de93c9cb16c9031e057d61b7e05c5cd0887a1ac1 SHA-256: a76ce89d15b71d78b5e0328803b6584e32ac7056cf246268a5a65893cc73d94e
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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://binarbaidequipment.com/public_html/userfiles/file/jazuroper.pdf In PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopuvexunopinuferu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/74381859771.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59f12cfcb---99520815452.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/gelipovijejejemomefu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/38847534973.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xolikenazoxadaribasetitu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630551023tusekedudetomodajivek.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/77443672117.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/sudivokasetoze.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/15179698629.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/47828820771.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/giponilejimoxusados.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/4489067891.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/dofolufibakopeton.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecca565fa---nefovigapuxe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/91626273996.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_140912.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • https://hojoairport.com/images/file/vigidavagowubugurer.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/49533540216.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/62465912461.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/sinuwozomopiwewadipex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+service+callPDF 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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 17588 bytes
SHA-256: 89c1f657d786511abd808d7884aa9830b39d8f4c0f74c6f5c83d2f6567e27aea

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