Malicious PDF — malware analysis report

Static analysis result for SHA-256 634187ef4b8632fc…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 17:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3c0475b875a4879cea9ec7e1ffb3fad SHA-1: 8cf541a91602e99555cd815a40ae26b55a7bb962 SHA-256: 634187ef4b8632fcc860b38a6864abe4a980cd8795b76221630aec0e9cee9e9a
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.pro9apps.com/app/webroot/files/uploadimagesfile/7818976251.pdf In PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/23733382402.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/lugezajuperakabufelu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/28ef0b7a05425f4569ccd2c3e2d7cb1c/54435073593.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vawemexozir.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zejoberegopugem.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/jipitipalamurarosagifeb.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d650f7eb546bd8bcf95d81c0a21d6825/xaxapubigajuligogetikoxo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9355156137b0c1d2859800d0f29efb62/sosuvuvepikulomebaji.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d04d4f0---vipoxunakuturiruduguso.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/gojodutipuvavilamefe.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/lkdff4hl7n71t9jm5jk6h4qufg/dasasavevuvorojit.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/35464908822.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/gasiropemaposegepi.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/297485559421627105868.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca48d3896---sidemidatamikixif.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/ronemugopoxetizawogajolej.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/71347648951.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a004d2d43---29832058407.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vagidubowekijazapiz.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/favinomo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rurekagasajosotojejowuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=giardia+en+perros+tratamiento+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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10652 bytes
SHA-256: eb8a0585b05a5580778b8c405fc02cdf0ea01748fb63ee4a57d6de094dfed887
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 20544 bytes
SHA-256: f9d5238197d7186db08f2f39c488b7f0b2b250fcce4267a006739cb3bb0092d6

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