Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb96a718a3918b07…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 05:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a651a77b1cc34b043ed7e3227f0d425 SHA-1: 28112b87dbc8c404fda8749c254b11a67db0a3d7 SHA-256: cb96a718a3918b073426bf2897b7c85497aaddd2bc5c547a1669eb8489ca378e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, including compromised CMS uploads and disposable hosting. The primary URL, 'https://ketchas.ru/uplcv?utm_term=mod+gta+san+andreas+apk', suggests a lure related to game downloads, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=mod+gta+san+andreas+apk PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-9-12/20210912015744279718.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/lefeposoxazepafamasebogip.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff549ba625---39891791365.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/26761228821.pdfIn PDF document text
    • http://jiab.net/userData/board/file/vetemogezutixumuxezofimo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908011004612.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/900f3c53d2ddc0fa2ccee4466fd920a6/gigek.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fafulopufomunawaw.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/73691031582.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/33117846527.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/2031430863.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/99064966196.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/nezivug.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/nafotamozisivinibemusasuv.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/52463186907.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/20988835165.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/37134639628.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///16217463247.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d937800b4---52512425340.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/54142332982.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/72613756992.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nnrar4g1aa52qis6rlkqc41l1u/zupasevejezasu.pdfIn PDF document text
    • https://0900107678.com/upload/file/lisepabifuputanizo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q4c0j1m754csgjf35eu0520b2s/30674250986.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/61255270454.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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 10516 bytes
SHA-256: 9f565e8d41921d3d57c8a2013c6896f9b5d20568aabbcadf541cfcc266ae9ab1
font_01_sfnt_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 14648 bytes
SHA-256: 0f521a445e8a4bab16d3fe9603a18fc582e78ed608a206e6081ddbd4a9e90b9f
font_02_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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