Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b6b6ebd6560c58…

MALICIOUS

PDF

69.6 KB Created: 2021-09-07 02:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67e10b11307ab8d92b8e3d1cdd5e19fb SHA-1: 56166c90fbc00be98116d20becdef466df580d2f SHA-256: b2b6b6ebd6560c58255b7adf39f062ceae80d10b50542cc96c552680ba08328e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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 https://laborke.ru/uplcv?utm_term=meal+plan+for+toddlers+pdf
    • https://searchkar.com/ci/userfiles/files/9487256350.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/45656479588.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/770ebd9f3136824395cf6a0b8cb27b9f/witizunutakitez.pdf
    • http://barudan.hk/UploadFile/file/20210807155904172.pdf
    • https://piauiaqui.com/ckfinder/files/43488533074.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/dd2897129ab9bbd9f0931dbdcb6403d2/26644029353.pdf
    • http://pttaccounting.com/userfiles/files/bafenedoxifuvegi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1d1d96231---puvopul.pdf
    • http://videotour24.com/data/fckupload/file/biramurek.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda2262c00---69504802691.pdf
    • http://raylutickenterprises.com/userfiles/files/59640233173.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/97917958398.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af912a76511---50003377743.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071becb3e747---zovizibobutukunefidu.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/14291879701.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/54346938897.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8ff1148f76141f091f1b002c96ecac20/83648963996.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c8cff486849d8bfe97639cd4251b6db6/sabukirajevog.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7f0b426bc---36268173643.pdf
    • https://erdenet.mn/userfiles/file/pupusoruwiwamemigut.pdf
    • http://files.ibiza-ferien.de/file/dalonoragole.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9a8334cb49faaad9728c80ea0caf4d08/fasijagiwixalutaxugef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e2.bin
e6c4952fab7aee5a3190cb7abda504688b2cde9106476c08711a807fb7ab80a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 14552 bytes
font_01_sfnt_off0000d902.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
font_02_sfnt_off0000f119.bin
0e810e28cd8865d8fd989b93d1ee392114d1b33d393f516ad88958697129abd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 10392 bytes