Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e849d4c40273b54…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 23:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 901cacaea57e020ef02aff37fd910689 SHA-1: ea7036a3cfbc98ac35b8fcffc56244abfc849595 SHA-256: 8e849d4c40273b54431c69456941d5de984ea7ea3b2e59fbab4afa9b06f5da3a
164 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 delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://toyotaprius-custom.com/js/upload/files/josewunanezewug.pdf In PDF document text
    • http://abovomedia.hu/_user/file/juxoxofuxabanatowalet.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/46234605397.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/14302060333.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/jawakekiluriwoxuxif.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/pipudewawupaguzewajogek.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/27541668572.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/41489893243.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7c602ab57b88668ae99e53c9d100520b/84657167359.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff56712b---wonojuratubito.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/57044002080.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/294a41c15be24e3e0db641bf257fc2ea/fuzawoxomilumozemagaduwok.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/xadazurojul.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/salumesonizevenupifamudo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/28928936221.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/61084254332.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/litagikifu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/34510512447.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6b7eb28---14287957359.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/50c5308d4f2b4d43645cf66c1de19fc9/70442845823.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210807161432.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c0ab8813b82f297e6c17502dd559c0d0/92512703410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cesc+demerger+scheme+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 19088 bytes
SHA-256: b367056073c61f2be0365f2868cb874f17b53b114ef3a37ba1bbc7a78f09c616
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 10476 bytes
SHA-256: a8137943b3d762308636a9d5968ed71b46c49999896f44660ec4362c08a6ff4a
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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