Malicious PDF — malware analysis report

Static analysis result for SHA-256 811dbc7625383073…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 10:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b52b991783e73af960eccddfe8f084b8 SHA-1: 2c9deda27addfbc9b43d70b61b12218543e16073 SHA-256: 811dbc7625383073ee35f0a184a417a369306698ec39ba053296bf2c88baf6ea
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. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/selabedibigomusi.pdf In PDF document text
    • http://goldartline.ua/userfiles/file/22892312058.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051503420573499.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tovasenudepolulexumemezig.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5e3ffc6ebb73d48bfe52d068c0e97985/zugisigegoni.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/4601157073.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/88217576705.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9aba03b67e5bd52e25ea10c8e8c2a022/91912109227.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zodikabobe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6f6d79754ee323d76a547d9b88420426/59376978365.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/panojiledinefuxegi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca2b1c19d---30268291766.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fcdb3d76---23043033556.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/86074932601.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0390a0f6e7---75555234755.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c3d0e287---80595477379.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd0fc9ecd---xuguzolebakirenun.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7d84177e66e4942535059853d121a48f/56332821265.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bccf35b37---nuwome.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/xobogarazefexelofexilom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reflexive+pronomen+englisch+%C3%BCbungen+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_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 20328 bytes
SHA-256: 7cfe2f165accd9b5fab4feb40cffe56f49dbec54d2e07f09e48c9651018ecb7f
font_01_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 11452 bytes
SHA-256: 22a4a8ff351adec8fa5ec504b757a2a282da80d98b8a6d2395cbfccd45c9030e
font_02_sfnt_off00015028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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