Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c75e88a7f46c852…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 03:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7495b0954e8fb8aa04fdd24458f6133 SHA-1: a162168bb7f11e62ce26110f36eb9bd1aec4af77 SHA-256: 6c75e88a7f46c852c3c0d27159072a9aa7392c05088f7676b5423b7e5b66e3d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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
  • 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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081a319590ac---pipakivubifopazur.pdf In PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/26146815067.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/12891946250.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2392a26c0814d1160e75ef4056e0b807/71705187618.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57c2c0d91---54645267372.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/82167504714.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lokamujufovusoxa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a4610d730---28528033988.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/mebubidilusejenusav.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/nimelomo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088290de42f7---lamororazekalatudikew.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/26211897869.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vojovoxepikazuw.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/tetebelejagobunogik.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/16306207824.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/bivenilumavivemanozupazur.pdfIn PDF document text
    • https://sce.tw/uploads/files/60bfd6757b5cc.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/25830714796.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fojirebejavut.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/nuzelare.pdfIn PDF document text
    • http://chinalabware.ru/d/files/18670287008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=medium+of+instruction+letter+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_off0000b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 10712 bytes
SHA-256: 3e87656f6bc75ac377dd26a305de24379830de532d4100d91aaf83b7d9e9907f
font_01_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16752 bytes
SHA-256: b5b44b1defa4c915fc2be68273a3520937db2a7b77c7163eb96897557ae396cf

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