Malicious PDF — malware analysis report

Static analysis result for SHA-256 c342052f934d516e…

MALICIOUS

PDF

104.1 KB Created: 2021-10-06 16:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5dc930752786945f2fe77df7826905be SHA-1: c81b17d09f31d45a19b52563aabadbbccad6cab6 SHA-256: c342052f934d516e7496ed74ad3e4ef4e32b7a3185152ccee9714561a2f436bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://infrive.ru/uplcv?utm_term=ohm%27s+law+series+circuit+worksheet PDF link annotation
    • http://zerosquareonline.com/file/94163963724.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/lexuvomowefazonoxaxe.pdfIn PDF document text
    • http://pb-book.com/user_file/file/28316072489.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/64786577097.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/50930994063.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/64729398329.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/pukazelobapazokuzazede.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/zidajusu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/99139952238.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/919379767.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/23/file/fujifukujemelumemo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141420103915---91691263840.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1633170769.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/16316653213.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0fbd94a3f611bfe01bcbce5e13324969/14947094367.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/95576106812.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sanukoguvab.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/8143353840.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/xirezatanax.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/63679049107.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f140dbef4---wiwuvamoj.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/luboguvefuk.pdfIn PDF document text
    • 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_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 20204 bytes
SHA-256: 760c76d69d099e38495d0b44f1cbca6c45053d5aa8700434cb2e87bb81fabc6e
font_02_sfnt_off000179bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BD 10728 bytes
SHA-256: 7492981454c90e19f3be60b9a349471c0f025ab9853a9dda4290aec346049a1a

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