Malicious PDF — malware analysis report

Static analysis result for SHA-256 f976d931f20aaa6c…

MALICIOUS

PDF

89.2 KB Created: 2021-07-22 13:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ab6ceeff1cd9ccd222d642d380eee0a SHA-1: 5d0045bc97a0c39e151036f3ddd10dc2cf08f374 SHA-256: f976d931f20aaa6cdb41cb1b8dca3198db3c7020c9ee6fdeeaaf42168880b49c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of these links indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/lidegizezefiso.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/60954975216.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/12041047255.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/10346687961.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1f6c4adf---wudirewem.pdfIn PDF document text
    • http://hncastlecable.com/d/files/nalepepusakagerabe.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6ca63dec0c332c42bc3c3bb612ab5915/11953428719.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ubphq20tb16ovmlfsh3151ualt/29774309957.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/vosojopopuz.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/75956829702.pdfIn PDF document text
    • http://gptools.net/userfiles/file/67255675361.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/43203168337.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/23649369816.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/17palj3ods63d8qed1efdpat63/90025803045.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/dapul.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6edd921b32---592782830.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/76702746499.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/69340521593.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/podikomoganobunuwu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d75bef0993855f16c7377b2d4911a65a/telajuvejobozimemeruxox.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074135bbc473---32241663962.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/povotobodobudipevoxawal.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075941723b88---gofubilotov.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7dee9ec97323db64cf55edde0fd23480/femawofuvu.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/60831411266.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4adfbbc49---zorisatuligafileka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stages+of+change+in+recovery+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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 11108 bytes
SHA-256: 1144729063b54bcfe153f29fafcc8b0007ebe08f4163f9a498a0f7965a3a12aa
font_01_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 16796 bytes
SHA-256: eb7175be53a48567e49a4aad73f284f7fec18bf15dab4886ca61afaa9e648909
font_02_sfnt_off00013e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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