Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d41518f048d0521…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 01:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b43f489db3e0e199a86da62805f966ea SHA-1: 253fe78d88f06d5bf0070634ac27a9741b30ba89 SHA-256: 7d41518f048d05213202e36ddbdee8bc3589339b1538f99f42f6210e82b859b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

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://nomylo.ru/uplcv?utm_term=how+do+you+classify+elements+from+compounds PDF link annotation
    • http://kokocurry.gm/userfiles/file/nolukuxo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n7p81kigcbksphns9d3o2durc1/dufabirexuwog.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/de04e049a4a9c5282a93ade94f93256f/gedileduxow.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210612172318_ztkexk.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/13771554347.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/16636601627.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/kevupuzebaxefowozizijofuz.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/61186240466.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce049438---82770413450.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/86297497645.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8eca988e---vubux.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/11672510828.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908c3d3fbe---60724012832.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210826_4C17099748640280.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/23035037088.pdfIn PDF document text
    • https://dafelia.com/files/malomimupatuwo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/767d96b8d9f21c3a48abe2fa55c7ac7a/xezejobu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab1055735695054e11b6fde5aeee1bf3/zikusadosu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tutir.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jupolisedibogenijutib.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948752a6beb---76416182434.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/acbb3176910b7b691c34c63ec7039edc/69255783848.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0e66f10b---49165945116.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17212 bytes
SHA-256: d4ce5076b0fcbf64fbfaf44686ecf0a82321c23ffd6939c4f58d3d3103198879
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 11072 bytes
SHA-256: b364a9ae1344bb6dfd84aa2e7871efe0c4d8417346fd8791372ebaba992dda1d
font_02_sfnt_off00013b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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