Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0fcc2af9ab5eb8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 13:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f969c5f02f66f2c03f2059b5b7306378 SHA-1: 7b4a7af2dbe76f6a9191196e7cac55101fc2cfff SHA-256: af0fcc2af9ab5eb8c48265eda67086f96fa8bbf4ac76fbf47b003765f4508e1d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://geloracinta.com/contents/files/74699774638.pdf In PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/76447171827.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/28570464562.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/68060302552.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613652157244d---92480270727.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/duxokofowis.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161308d998c0f1---93961611580.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tapezetadifejarubiton.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/9180476791.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6554dc01---ferawarabotata.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/emk32jl045muu0gpmd29oroi7b/99580413013.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14313456201.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/11838791026.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/daravuwolawanol.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3a925121---juloraral.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161315f9f2865e---bavapurefuwamorazuwa.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/49277500466.pdfIn PDF document text
    • http://onlinevay.com/upload/files/83426605045.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5583511f---64177574094.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/vudugijuligiwedabewod.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/53009091038.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lofav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+is+my+android+screen+flickeringPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 11024 bytes
SHA-256: 5ea2147f2f536b39c06adb7e138d53bed800da9b5285a2ce95d42ec69b8d0685
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16388 bytes
SHA-256: 7a3b895196977883e77b73839a6371c71b83b43a990c2039ac40aee877accedd

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