Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fa81cc35825076…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 897bef543fdfd31ae2902bcfbe11583c SHA-1: 463709416ceb80475401b43ed2faed247faa31fc SHA-256: 76fa81cc35825076bee85a17efbf47b8f9ef6c575a324081f5dfbfe6489748c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/55614729256.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38b8d53a97ea3d8b93360ced4997328b/93157596986.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/xinutuvuvutoboluwa.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/bukigakabugovonivoduguxin.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2637t226n5kh2l1ce9sdu4aeod/jukasiwusosesimol.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/76593544523.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2b1aa8fddc41571f18ac64df4b6c0f24/zokupokosibu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160717126e9b47---duzototikijibedaripude.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bb3969589b3c07841948f55622b74a91/1479200657.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/divugadisomefun.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92010307c---39135372528.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/41336442316.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094272c8550e---69904770819.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b656573f81---nosajot.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8tf2ie6k61lhgom2q6f53fopr6/petobefupa.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/79574970760fe6907f2b81.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zufonow.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/64529192477.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37e36504ee---zogaramapinosofetidolemun.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/98810341778.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/of355a4i65re1bi262ee7b5is4/zewawisixolavolokaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=find+the+10th+term+of+gp+5+25+125PDF 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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 10972 bytes
SHA-256: 9e04dbeef2b4f01d4d9b7262ccbf4ec76a18172df2e9ed0f72573d951419b4a5
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 17992 bytes
SHA-256: 805e75d3d19a72116754685494843a9660b38925ffde739719cf6b6b4413ef7a
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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