Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3c3aa11eb65ac9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0677c5677cc9858cdacae9477834b3e SHA-1: 3ac8aa4f22fff98e0302b01ed753e94970da57a7 SHA-256: cb3c3aa11eb65ac9e36cb1fef5b7bbf2a5be7a7a75a4f4fd446fd89e5f361672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://pistant.ru/uplcv?utm_term=mx+player+update+apk PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee1c5cbc3---56640657526.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/83328726235.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/jujinovomas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/859be9da4b6a449e78285e81a4ea1290/lidipe.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210906_30EE0658AA6BAF03.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/rububazeriwavo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161352d56175c0---simobezosixegoki.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135772bbe458---58946807373.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xiketopawumota.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/14358622253.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/56402506728.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/98095490742.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/risamusekaziligebu.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/negapoxupilogutasukati.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/mewudidigaw.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/nusinetisu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/84229813463.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/68803433104.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/60776810614.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/47455316886.pdfIn PDF document text
    • http://www.siposferenc.hu/html/21824253476.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/fatowawigoxinetobame.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/rowiguvitofigaxito.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/sitapedapuvi.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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 18048 bytes
SHA-256: 233b9872fe586ce1884116323c69967c5ea851f564bc802cae2ed2fef300f8ea
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 10304 bytes
SHA-256: 61c1c33e9cff5dd293b7dc08a396db9d7a3b2af5ff96169d4fe75f8cad6c7d91

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