Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bc12856cfb15d0…

MALICIOUS

PDF

62.3 KB Created: 2021-09-23 22:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d360211b480c3af06b04f97b04991eac SHA-1: a19bf9729bb21028fa4c71f27c9989584be0e74a SHA-256: b5bc12856cfb15d0d70c00855e5664f8a42a2642b892ac053bb609be0f387103
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9100

Heuristics 6

  • 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.
  • 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://lexen.ca/userfiles/files/75871222768.pdf In PDF document text
    • https://mobilieroccasion.fr/uploads/file/29073739799.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210919_482302A3C1072630.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemebabi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc78d180f---58852334154.pdfIn PDF document text
    • https://fuoriscena.eu/file/51486438711.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/fobirexakenezepalet.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/figinur.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/336960673.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/79095093733.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tetelora.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d466f1d2---mavefajubaxijirik.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/9230618312.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/zupugikebanamavawuvorexel.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/17742140146.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/38046732408.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/30141867988.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c9jn0hnnnbep1npskqkh79mge0/49170869422.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210921160529903304.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/salumaduxareduregu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/82730254090.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/58696321858.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/35035101093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=toefl+structure+exercises+pdfPDF 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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 10512 bytes
SHA-256: 4e80142bef67fa0935cab2113ac7b31b66d5bd076a37487fcac33e2fc2edf696

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