Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8699bd5f3b90f83…

MALICIOUS

PDF

61.0 KB Created: 2021-10-08 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68076f8fbc1f2b7c84326cdcea0ef178 SHA-1: f5e328e41949ec2db0563ce12a0a96f1f0fa4df4 SHA-256: b8699bd5f3b90f8322b3c3c2ca80de11b2a94d0ad803067e194b4c9194c297e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this pattern. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7149ac06bd9992aa259c5b960616a6b7/dopupivugimumetokiwemi.pdf In PDF document text
    • http://hamdannepal.com/userfiles/file/91021572529.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/26173140967.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/53821040745.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/42061394234.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1c3d0ca8c590ae65844091e7efedf99e/lebifojujawadojoz.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/44754425992.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/57727821241.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bisugesaw.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/71266234283.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ajev92osvndccio6rfsl86f7u3/lisutumine.pdfIn PDF document text
    • https://cmf8.ir/data/file/86719050704.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/pojosinarusukipesexis.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/rafozidaxiralo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kusujujoxenimixurosi.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/50390652403.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/gizuka.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/30897674334.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614506aed81c4---38969622202.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/vifonijunovejusuxiwoj.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918142301729363.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135894378c41---27447986000.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/79c08293193f2af070ad2998233325ce/34427830044.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/vevizavatikazevu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/janogaxagirazufinuvuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=c%2B%2B+if+else+exercisesPDF 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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 9976 bytes
SHA-256: d61cce7063c19fb2279b75ea044b3d0d79d499dc235c503b4335a3b85bf8709d

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