Malicious PDF — malware analysis report

Static analysis result for SHA-256 947e850a77eab655…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 18:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecc7ce7d790092685782da288b13702e SHA-1: b8c01707d206ad6edb88010905a8358278522162 SHA-256: 947e850a77eab65572549bd05934ff3eeb9e57d4a32d8e255a1b49119e9567fb
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 exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://www.jacenter.org/js/ckfinder/userfiles/files/91057401346.pdf In PDF document text
    • https://mimpishiosatu.com/contents/files/sujefu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vagedijolaludevisoguzodow.pdfIn PDF document text
    • http://erdbau-rauch.at/32070160897.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/luxusujupekedura.pdfIn PDF document text
    • http://strandedtattoo.net/file/konigugoji.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/99814847447.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613503ca989c2---30349003803.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/duzobuwi.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/46274753948.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/wuguforexexodupususulikuz.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/ponulamerej.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db85f9a4b2---kutegawez.pdfIn PDF document text
    • http://szcftz.com/upload/pelonubuvurugirume.pdfIn PDF document text
    • https://unaizahic.com/Files/files/82201265037.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/11107426170.pdfIn PDF document text
    • https://hiroyoung.com/data/files/junapinarifewadotigin.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xavefodagikulaj.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/75875182109.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16130e141a34f6---63774333102.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/perizurosiduret.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jeborerakobejoluxub.pdfIn PDF document text
    • http://telektrans.hu/editor_up/32113331855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kung+fu+fighting+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 18300 bytes
SHA-256: c35e95be7076b66d2e7f374133a5a8c8ac39e87898c0684b932c306c05899560
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10684 bytes
SHA-256: 8722ae1e2b424dea6df784b8037c7afcfbfa65e92ac6ad87c2d4fc67c3081096

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