Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cc2aed433a2b71…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 11:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f2be5b9c88dea19208d66547114b8b2 SHA-1: 0ccce30a8b744fbaa644770deef78ffa42fceb84 SHA-256: c4cc2aed433a2b71b43e27210333cc79229f601f50dfd90067caeea33c35857d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://psfund.org/public/uploads/files/cms_files/xigujogalexogofesumowa.pdf In PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/86508565381.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sutowadaxalisul.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/xozokemowuruzakevotupad.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/zavel.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/52865957999.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/lakasizugujujabedowekozu.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/zowodaba.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/69878325643.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/97190953522.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fuwedubilixikepegofalalid.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/67253559973.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/41939657225.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/14048417387.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/roxedufanuwaba.pdfIn PDF document text
    • https://successalpha.team/upload/files/zotigonumap.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c762ee06e---poresapirutomutowariliwi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161462f5342ada---faretomotoj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5955b5a40---sesuxamilepul.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/jofitagowoluvip.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jatisukin.pdfIn PDF document text
    • http://boki.hu/editor_up/97941912900.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6f5431c4c6cbbf6c0f9cb25a1f13a49/19946273004.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/21649708828.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/14073750808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gomax+live+tv+apkPDF 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 17368 bytes
SHA-256: 88546a811f434614c4ec55fe3c336f1dd6791b8c5d73fc651c579ed2077ceb19
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10340 bytes
SHA-256: e479238139237f7653d4eed95749f264473f16f140b322dbe86717e67cc6237c

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