Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38c9fec1ebdcef…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 14:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f497b2cc8af1fa370392fafecae4f835 SHA-1: 36e2e2ee913e183be539f9c999b0f314d4f7e219 SHA-256: af38c9fec1ebdcef91553f5eafe2355b7bc4d1a78b8bc3deb428dd48c499ac80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Heuristics indicate it's part of a link farm, with several URLs pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vrakskodamnetice.cz/file/67357479305.pdf
    • https://tylbm.com/Upload/ckeditor/files/vimarixarotog.pdf
    • http://verynailscm.com/user_img/file/91454954883.pdf
    • http://dblbtech.com/userfiles/file/mefurivewudowuriw.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb026a471---41712021566.pdf
    • https://susta.vn/userfiles/file/majatifejenudimelu.pdf
    • http://locke-3c.tw/uploads/files/202109170443062657.pdf
    • http://nandishoverseas.com/UserFiles/File/rinuzagomotigaf.pdf
    • http://ingegnasrl.com/userfiles/files/23881128044.pdf
    • http://www.amedna.com/userfiles/files/97642778494.pdf
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/11857429313.pdf
    • https://fabriziochessa.it/userfiles/file/xulekizojo.pdf
    • http://ghefootmassage.com/fckeditor_userfiles/file/58127938054.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/80658335638.pdf
    • http://volker-issmer.de/userfiles/file/bazalek.pdf
    • http://saga.diamonds/uploads/ckfinder/files/25245469502.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rp8pu3oea1cqufut5voe10gt2u/54913199096.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377cc3c8884---tiwibipiwag.pdf
    • http://lideparts.com/userfiles/file/1631353648.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fifa+15+mod+android
    • http://irodori.kir.jp/files/file/55324299278.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_off0000acbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACBC 16792 bytes
font_01_sfnt_off0000c4d3.bin
c18e3b3e0fc9869633b82a893a96abf09d2729af13a82d26e082c9310cd0ec62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 10232 bytes
font_02_sfnt_off0000dbb7.bin
aa8c58342323fc5e5491caecc576bf2188c61afcc6220c655e38872b8c5c8767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 17008 bytes

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