Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff381619697821a4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 17:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f29ab2f13a4efc70547ba26b5706a978 SHA-1: ab0b47f0342ff106ac5cf6c68e3cc67dcdcc312a SHA-256: ff381619697821a45e3a1b6d7400a3f1b5f5f3dc0aaacada06acfe7fd0fdbb87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and other potentially malicious domains, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e2253efab07d3025c6e144bef5838218/35793469684.pdf In PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/sojupegesakemefuvijokom.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/72593cb509cde13e4df76492d677633b/wugakum.pdfIn PDF document text
    • http://funperm.ru/content/file/73469110106.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3cbec9f4---kufajofisozedumopepax.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/jirarurojebaxepokexipote.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba4058981b281cf0faf2308314a5b4b0/146601892.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6765da54555eedf85aebeedbc71afe3a/guzuxukuzepilob.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/33713816316.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///91991457756.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ngh85asrjqfik9fqr1uchvep3i/50009668293.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/66749021254.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/bobamigubaxe.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ms9ruf7b1n52fq4vgfsmj4hi61/78972136095.pdfIn PDF document text
    • http://katachizu.com/img/news/files/japeropakedurelij.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631bdd2dbe---78952040230.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb641b53---balumevenolumikusepaf.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d79bf43b66f---51193065655.pdfIn PDF document text
    • https://wecareprogram.org/images/file/pusizubo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/46762657867.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gvr15lrc3elrjq22tt3g3untq4/zafujoderodomu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/25983339277.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/12114858164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unblocked+games+77+fireboy+and+watergirlPDF 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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 11308 bytes
SHA-256: 72d3660cd0b7dc680b197965a7780fe1d60e3f37c9707c5cdc4699755754ab15
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 17712 bytes
SHA-256: 032d8eab1f13cc3c4c4507ad10db7d942f818b5ae8d6a66167ca41f4ce4b4486
font_02_sfnt_off00013cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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