Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c9c1f4725c9d7e…

MALICIOUS

PDF

188.0 KB Created: 2021-07-15 14:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f4deebb8476190491d725a29efd0a22 SHA-1: 6788c2aa5a2f1afcb3293a2e2509efcb5e84c0a9 SHA-256: d8c9c1f4725c9d7e436c65c6c7eb899d0aea482a1c9da338d0dc84b90ec62c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9655

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 http://ebiocell.com/uploadfile/file///2021070820035765.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09307d561---17347113899.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/kaxagofoliwinunisagu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d30bc7362---59274773306.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xitafuzusiva.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/91222417187.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/86019139084.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k4avdf1qgj2n3vjnkqfm7d16s7/danomilotaj.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8724b01319af768ef4779fdc03e9d7b6/82097022964.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kirirorevejozudimorobela.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/62290402564.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b09f34fa---75464644201.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511042929979.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/77619503707.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc4952c4a5---wavuse.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a4ed7991b---beruninogalamijeju.pdfIn PDF document text
    • http://pk.mo/userfiles/file/91890846681.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/268a462faddf9de97eb2194d6ddfa293/kaxakadasokinubazuxagapi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ukj45ihab2oe80hf9odc3gir76/14504821079.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/01003152336.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/41679357841.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/4901381453.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c0133595782d94585f31b9cf995524/60037077493.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/bekepasiwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+jehovah+ebenezerPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/detaxinofired.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E38 20264 bytes
SHA-256: 703a7a51635b21f64b47d511609297f275ce6d64d3900626d96eadb78593dc30
font_01_sfnt_off00029064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29064 19336 bytes
SHA-256: 252ad40cd12cebfd11a4e4ac7f3bb1cfcccd12f3b8bf6da96af39a802bb5bf8f
font_02_sfnt_off0002b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C975 10572 bytes
SHA-256: ef51a0a55e4fc28ea3701ad5a0dce0c3de1716e7f6cdcc5b036b3f83c357ceed

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