Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc0b37dbc3ba793…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b834689e09fadaf31f73ca9bff36a4 SHA-1: 357811f6ca295a65603938af5cbb0d5492ce5c5c SHA-256: 6fc0b37dbc3ba7934b7431aefd4ed0f9cf1a40689435855bf1eea604c0a088c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/46310901120.pdf In PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jixebewufanademon.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronobotubebap.pdfIn PDF document text
    • https://carlojans.com/cms/file/xewuzixolizaful.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67ef2ad93---luwelesusofetazup.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/lunolusarivumalevamu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/151792568fb7a5ab5f533ce3fd55d4c9/24280809170.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b706cb32---vokivogugewoxat.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/64829045378.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/dofilimeke.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/38807402996.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/47891116575.pdfIn PDF document text
    • http://congtyvima.com/images/Download/54882351172.pdfIn PDF document text
    • https://diphong.com/uploads/vubobidatagipafuke.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/12436821852.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f24584553---52729850432.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/59838923776.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/55794549780.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/votori.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/74af83aaaab6a572792ec837f5948ff3/refavoxexavavupa.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/61694591422.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5516b568e2---dejolala.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=2019+gmc+terrain+awd+manualPDF 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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10976 bytes
SHA-256: 200ab83bed44b55720d5b93b049fd6dd77a5ec04ee1dc0d029279ce3feabf97e
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 17256 bytes
SHA-256: 25870d0820aeef234398b405beee25e5f620f05545c5336d420a4a8b3a70de31