Malicious PDF — malware analysis report

Static analysis result for SHA-256 1243ff3d693d6e5b…

MALICIOUS

PDF

93.5 KB Created: 2021-07-02 18:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a324c154ed871c10bdd01adf21c0619a SHA-1: de1d74f7cb91bbd6023853bd904066e4b8350e0e SHA-256: 1243ff3d693d6e5bd6adfc28fe19f7a7aa227759fc2fb5868ad3361d5b38e58f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://anvlaw.com/userfiles/file/vuxexu.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/belexulezerodawobikasilil.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/47947505155.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/71bf04e659d5a55f65009836bbe27e16/jidexulufasevidisazij.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649a852b78---89020113576.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1ss46olojeeeginva6r3kfre76/sejupogikubimuriresenoten.pdfIn PDF document text
    • https://energooptima.hu/upload/File/77269451949.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vufaxafajelupigizevo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32f2f64fc0e2e27721f37880a4432ca9/korenagiriwusedegifazeso.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bokikafolomapu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3e9d6b9a1bfd76b07e8cb31b7ec84f00/nuwuwubexerosikolotux.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5dbec56e---soselobuvefisiligarima.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071299b6e79c---niguxobisodogukasekene.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4f84fs0008eabk52blecp8aqaj/82783150923.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/51506654951.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606df7ae74508---45955412930.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/48187184015.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160daad0852cc6---41113685075.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/40887520163.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/1579904915.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d397d2d4079edfe58307c3f2ad243f7b/sogifolikibuvepirumofe.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/95998048787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=accidentally+ate+piece+of+plastic+forkPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4ba3a0bf5e080c36943a5fc876c675eb/rikogud.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_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 17444 bytes
SHA-256: 4ecae01c783b7914d746f2eb2225b4a118d1288779f9c0f42755ab9c50dec7c8
font_01_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 10800 bytes
SHA-256: 5f6f3f9151c8dc2ecb4b2046be73b42a756eccdb04b3f04b1705bd003c876dfe
font_02_sfnt_off00015075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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