Malicious PDF — malware analysis report

Static analysis result for SHA-256 662b151766a185bd…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 19:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05f7ed5601a85092909c03c781b13ae9 SHA-1: 7dd312c7a685d6f2b227aab28a3feaa290a7b806 SHA-256: 662b151766a185bdbfd8132ce2b48d873e167a62ccc5fdf4fdfe054bddae5696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=wheel+of+fortune+apk+free+download PDF link annotation
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/gibetomatenujinuk.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/makozejunurabirafusu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7d38a915b833c8b8856170e5bf997c73/dexixoxuvifetodoxumojavo.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/83455552659.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/53211304650.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/41540907337.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/33372777528.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ad292589---96283778228.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/ruxuvokemilopidife.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/15678742156.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/35911763797.pdfIn PDF document text
    • https://successalpha.team/upload/files/lodixulijawot.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210911180712105.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613082fa5d5f1---mesafegaroxajefi.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/56219862008.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/82110275318.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/fufavideramokeviwe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f039fb7d87---virelorepojurepaj.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luserovixobakipa.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/43840020550.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/fatose.pdfIn PDF document text
    • http://chayka-svg.ru/files/vazubujolejukunu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/debatibokamamexuri.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_off0000b897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB897 10604 bytes
SHA-256: 05b4d956458a37c5a53e0c1f6832c3048c3fa848c57235b14848319b0663346b
font_01_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17180 bytes
SHA-256: ad9f47d438071e6ad9f9602f1dab0c440e341739dffa2b5c68b42458646e1f0b

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