Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ebd66d99de064b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 00:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f95ba77c9f9622d686c0490d06a38ce4 SHA-1: adf2c42c0a616c7f5941893d90af5646d2c8db1c SHA-256: 70ebd66d99de064b00666806f6097c4ab2872d054a7ab19dab277df777ba05dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://klenderbio.com/upload/files/10067089750.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/15573284191.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4144fb8f662099a4d71c8858bb7c2a27/lufakolanogejimukamosugi.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/sujanategowawasekela.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d74fa6070b17677676aca73e9cde48fe/mumudeseminigoboj.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buwopijowupevozapo.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/uatg837jfhacfte3vmf4pk9215/wukeba.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sropldl6c12oe4haecq255unla/29883103715.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/74de6e4cacfa4f1837e67a5f98f503b0/lekanebiripoguba.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pajumesuwekimisijupogafe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/65d3b073924f2d47a070b37db4fb23d3/watelibam.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/38295762749.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b505a92eeb0---dudivaguno.pdfIn PDF document text
    • https://uudanbury.life/files/file/98870973170.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f013ceab3dcdd53e79f6bf0cc7501746/bifevilixigabajuvix.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e93e3a46049---56648533582.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/511a941b5e95356d2ebfba874247908c/3242883906.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/60012222941.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6771939459.pdfIn PDF document text
    • http://bamila.vn/luutru/files/mupimatizuxetigefodixok.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/60267741401.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/lukisitetipejawu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c8d8af---boxagabenobapiberitas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=electronic+cargo+tracking+system+pdfPDF 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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 17588 bytes
SHA-256: 3663d9fb5b5c56c6474d8694fe37305fad0fa73638edcc1357f8da58ee2b2b5e
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 11152 bytes
SHA-256: 1d97d75ea06c57606af34bb0a93157c99c07531104848e6e58ec72960b5745bb
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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