Malicious PDF — malware analysis report

Static analysis result for SHA-256 c035806e7b514083…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 23:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: aacf68038964c2be351de4909ac89a43 SHA-1: 91e05dab5fc76b1ee9251278ba2b2ce1c0a63c55 SHA-256: c035806e7b51408349577238fdf2de67a9a59359b033c97e2700a0c82c923814
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://szekszardportal.hu/userfiles/file/52133441784.pdf In PDF document text
    • http://merlegdoktor.hu/tmp/vevofukulitopo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tabijukuragomotedakipapij.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bimesomewos.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/73564520938.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rijekegalirapaguwu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/29rsat8tufsbiq5r4p8neq56hn/solopiloza.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/xexibanenutedukewivegara.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080742b8e0ff---30672974713.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa1beeb69---89117782666.pdfIn PDF document text
    • https://razredna-nastava.net/files/nezumil.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/9276303278.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/i4vgq87m4jqc7gjcgv1lnscb8f/vunuwinefipetakixaleruran.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/bosomorubifi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5814daa9f---71228956747.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6632bebafc---reloxobekegurofi.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/poeu5q6d8e56g9rulrdlh6jd17/sutofazapani.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c429d36eab5---gipudaguvabemibo.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/mulasafapojiliretu.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/23997754078.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dbb7c79b1a13f31a36cef8741657284/famawewesaxaxexunerisugi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5257157df2---weloji.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051d7aa63b---kalusanalukakejejesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+makes+rock+layers+different+colorsPDF 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_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16600 bytes
SHA-256: 0c12a7b7c3b052ee89c642ef9ec19c012838e28dee6f28c8147b8ffc17fe6387
font_01_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 10940 bytes
SHA-256: 5f59c08b331712ea5d5cf532e27d606e8c96bdf220879d680deec36bdc2c75d2

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