Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c3626d29d07f9b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 13:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8820d35836917391314efb1879ae584a SHA-1: 5e9a4b2a15b0a2cdc39928fa685186aa6bed6e22 SHA-256: 91c3626d29d07f9b75a89ecb67e83d312b16bbe55bf93285cddbf11fd91508f2
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to download potentially malicious files disguised as software cracks or other utilities. The presence of a 'download button' lure and instructions for handling password-protected archives further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=foxit+pdf+editor+2018+full+crack PDF link annotation
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b661947d1---jobovebawujanazozowotof.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/6677950306.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/79477251318.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cc25ddf97bf8e2fc3cf424b065594b8d/84546732024.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/rowaso.pdfIn PDF document text
    • http://afslab.asia/upload/files/89263283324.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/26145987865.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pozudigifavi.pdfIn PDF document text
    • https://adium.ru/userfiles/file/bibiwomaluloniruj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79359817687.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/77172363468.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/xasofaligojufurusoboki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb767f0ada---migeleriragozofo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jdso1k35uo0puuved9ad891gq1/88331830984.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/17952239146.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/vidiwuvonodaf.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/97655087680.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/73853fbc90fe2c5eb909f3535cd528ac/46193619965.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bojewavatoxabixetoferobun.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/balirebuk.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jevu8m6b8c11lortsl1sauvc4o/tujisaget.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcd1898ac4cfdcd39fedee1abad7f119/91050574777.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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 18364 bytes
SHA-256: b63ff27cbb371e6085300708176cca1528144c8ffb5de20d4d507f6043fd6f1f
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 11112 bytes
SHA-256: 539365a9d31411697802e86b1c135f6a3a8f3fc55c146f0885535dbc4cefe14a

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