Malicious PDF — malware analysis report

Static analysis result for SHA-256 902aa2ba68279ae6…

MALICIOUS

PDF

94.7 KB Created: 2021-08-27 21:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dd611ef5caa99c16b720119c252b5559 SHA-1: 87d951a6467bd5ff89d26e47414ead5982797c3c SHA-256: 902aa2ba68279ae6b90bbbd52c6219e2e01e86cded1de4d010a6f2b67777c62e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b3atsvpmt8e4fjpigg7v086ad1/54684930985.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/88119947873.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/ridikideka.pdfIn PDF document text
    • https://abeess.com/userfiles/file/42350169753.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/o8u2eg92uhpmeodoh5mef1300a/lasuwimawot.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db99c15cc---fozokirol.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/xesim.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c2f93aede---joxomefowomikekixo.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/40313083304.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/vogeligafesodizofabebidi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160763b6e1f1e0---42419368697.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/34970637062.pdfIn PDF document text
    • https://ovalpolycoats.com/media/biresexulutatipare.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9102b8f64a60d75652e03c37603eaceb/koredifabozen.pdfIn PDF document text
    • http://epmachine.ru/d/files/pazebogegazozaravepaj.pdfIn PDF document text
    • http://betamarin.com/images/media/files/17223761091.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/kesuri.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/21127399798.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161171dead0182---14757174212.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/45241671935.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/65478677494.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6810d33e6---tevibodelurijajasevo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/57024298760.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610637e9a400b---34411773923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=annunciation+of+the+blessed+virgin+mary+catholic+churchPDF link annotation
    • https://d35r3vzpjv6bi5.cloudfront.net/11842/slideshows/homelarge/inside%20church.jpg?t=1588693375000In 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_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 11324 bytes
SHA-256: a62e9b15138854a8a1eea6db9712d6d1eede9577b3fedaeb9fc2b2ef60ae1a19
font_01_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 20576 bytes
SHA-256: 4c165d1cb0622b04996c9903d59b4f8fa3fc44bf84536bdacaa62d70508c0c2d
font_02_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1