Malicious PDF — malware analysis report

Static analysis result for SHA-256 358de74b77ad31fc…

MALICIOUS

PDF

78.1 KB Created: 2021-08-28 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b87a83705b8c62a6c977cd045844031 SHA-1: 03c1b660c4d151c9ab11b4c9b2d974ada73791ca SHA-256: 358de74b77ad31fc062a0c4af63ccce933d6e8bcc46393d27097ce8dc1a43f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other potentially compromised sites, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an intent to download and execute further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • 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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uukqg0n00lv28efla4nlcf05d6/66533111093.pdf In PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/89696603746.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/34781998257.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/dewomojapumenasevunolokej.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e82ae12f---94843097167.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a655b030a---18226993598.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/21960648503.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/jukaminomokewutogu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/wodejavevuwenogiwinif.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/89915466098.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/biwugirepimuzelufifogumim.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37682534399.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/78c56c55088149014137e6025862eed3/sigivij.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/letunebinakizuta.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/617d55a6880f6b83b2b2eaf0278151c7/solibaxisakilaziwajizef.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wozivewimatosadaj.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/rofaro.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/kasijaxolizetewaz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/61362b9746383606d2d9e0822f1d0cab/29420330072.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/tusokizasuligi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa901d47678---domebafogobedaremugi.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/53797129465.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22372915770.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f5c8bca780cd9588de2bf424adc3c08/99740049889.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/savirokaxolusozupegiw.pdfIn PDF document text
    • https://xigmatek.com/upload/files/naxixagim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=having+sex+with+clothes+onPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 16876 bytes
SHA-256: fca738e550a2a4f5d763de68c8da1a7e2ba025feb6c2f47c41408ac4742472a5
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 10652 bytes
SHA-256: e193e421952074acd317069f24dfb2ea304ff128cf5d7b59fc8f0e55c33494a8

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