Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0f4d7b4d8cb182…

MALICIOUS

PDF

64.0 KB Created: 2021-09-03 01:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48e660d5c30994822ed750d0ae470b3f SHA-1: 51ceff524cafd1108253ee44c53b4b2113bf65c9 SHA-256: ab0f4d7b4d8cb1825f9a36b4da7d916c12e14fd26aaf252d28e8821cc53e2552
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, which are often hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9203

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 https://inwebjor.ru/uplcv?utm_term=spartito+the+scientist+coldplay+pianoforte+pdf PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abf83c3e0---82095993436.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bozenemajoxuk.pdfIn PDF document text
    • https://kuepancong.com/contents//files/32416480188.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/dijivaxegada.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/53503623278.pdfIn PDF document text
    • http://chayka-svg.ru/files/39199940779.pdfIn PDF document text
    • http://vuason.vn/upload/files/gugebedabowufo.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/sekebixuliwotap.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/95983347316.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/35506012441.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/favogolurubag.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/21109846467.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebb431713---59658887117.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/52976017587.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a067045d90d---losuzasejumugo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0f1788a6---65117005114.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16071d448cad47---lazunejegosorevidit.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422c5aae32---86776041133.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/82426404788.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/63522336291.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vasisuwelor.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lenufawegoluk.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/79997992071.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609869bc0d953---45819567738.pdfIn PDF document text
    • 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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 10908 bytes
SHA-256: a180c310bd08f9ffbf43ffbd3d3f8823c1c72b04956d0edf6d507f0a445cff04

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