Malicious PDF — malware analysis report

Static analysis result for SHA-256 b274b68728a32762…

MALICIOUS

PDF

83.4 KB Created: 2021-07-27 20:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee790f971b18f62e89ab08312d534e0d SHA-1: f26b2f268197acc4b91112992c38e36d03a4eab7 SHA-256: b274b68728a3276283fa46f15380b4cffa89b5279f961f7e23adda1f2b8a079e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other unknown domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chiuman-hk.com/images/file/46510472410.pdf In PDF document text
    • http://atomleasing.ru/media/File/wukuzadagox.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/sutazowemixebaviwuxis.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f66fd6ca2fb32324b349f371f467497d/79544415710.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdc5204bf---tuxobakitik.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747fdf7d87d---78229072372.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/26634339316.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jikularidubasirutafogitaz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4c64f0feb46537a089193dd5a1123f7c/31466915566.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/8155669017.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1930f9e8b804f20f4100d6af5b31084e/sugikisowamavujowow.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de68d67c09d948fc27bcca5ea65bf865/sesowivuzipolufo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099f37641e8a---70264788314.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/69889396617.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6a599608---xigegej.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070714448d2b---41815278026.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/pubapelezodisopolazinaf.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xevekulazuja.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tomujefozejebazog.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/nuzemigure.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da64e9c3d7---78456548045.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/aee16d100957cc0c63985fd145b0c969/95900264412.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8e60d23c1cabcfc7c777416601307058/64904097988.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b6aa4775ceefa2c8e5fbeab22867fb29/guwozikel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=newbold+statistics+for+business+and+economics+solutions+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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11084 bytes
SHA-256: 190a12818226b6adfda5a9a798629ade492ff8a00d5f32c9feee2c6ccc6741ae
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 17668 bytes
SHA-256: 7e8a47e19b7b4e5320368d85298010569ba83e61c7946b30a9f1a49cf2408529

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