Malicious PDF — malware analysis report

Static analysis result for SHA-256 13670205cc575e9e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 12:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a58889e050b413e37623007c21798f2f SHA-1: 24a1844e4173342c5c4abc038950cafaf7dd93bb SHA-256: 13670205cc575e9e6f956d226c4c708805598bb8cf7da4680624afe989a42342
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=wipe+cache+partition+app PDF link annotation
    • https://groupburuemas1.com/contents/files/zuvuwagunuruvofaxenix.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/popesozimonefaziwovak.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/87ef9fc2e31ae8828320fa5133c5b02a/67167872827.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/52569951727.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/38642804455.pdfIn PDF document text
    • http://btfa.tw/upload/files/91776749894.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lorojikikawomonolevupixo.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/doninudaxevoz.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/32682938077.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39d849f94---pumorixolepogafifivek.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/retidawixolojegofotulin.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c46470a67---pakatukabagelogeme.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/riwetedapev.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/sejif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da86f8a542---96269877024.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/63947348966.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131339328009---febikadukifomakuvot.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/komadibodobogo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sezivozapul.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15652884445.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/74807904849.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/kumofagid.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/12705610397.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 10248 bytes
SHA-256: 6532e936d849c505f5d598489213573fad283fccdf9392021bf93caeb04216dc
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 17700 bytes
SHA-256: 74c96c8272d5bf01b2f1e512a0c5d215b468d0f505c6ecf78cb542841fcbbe51

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