Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22752c38f2caadc…

MALICIOUS

PDF

94.6 KB Created: 2021-09-03 20:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d64e98deff13fa7ebd64778b8c134620 SHA-1: 2a320fd07d59ffcfb50c064a6b50c880dcd8af7d SHA-256: e22752c38f2caadcd0c886d694d3eea8621d7c1dc1692bb2a35da28922fde643
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160724bb646816---tomadedisijelomijodu.pdf In PDF document text
    • https://avenue102.com/uploads/file/32533308372.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/26787854452.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/fudamelir.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/14502360756.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bobidajifugid.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/kegomovivetamovub.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/43ae470d2f6802246e4e837133f8262d/73841413697.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210802151255_933389135.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/vevomujafatobonuvej.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fuvon.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/51421969278.pdfIn PDF document text
    • https://majubesar.net/contents//files/20679670525.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/63345775824.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0facjdcb1620cl5f1t85e0osp6/297140473.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/57810401127.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051723091862.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/wubusolabam.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/34863884744.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/funonaganoxi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d1750055---24349233659.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44875d4d88---4618916048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ikea+ivar+regal+montageanleitung+pdfPDF 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_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10880 bytes
SHA-256: 5c00288fe80c1d2823a7ccad75d563b2fcf07d5b149f44d55e9bf206b6c01714
font_01_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 20408 bytes
SHA-256: 65a058865bf4260e1c52a8218548c2fcc14d3863967cd690fccdc38569bf0f8b
font_02_sfnt_off0001548d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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