Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5213899690d61a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 00:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94993ab2e28a5d19254944413fd2411b SHA-1: 285d06f15e86bf405ad555b9e0a85d95ef569b41 SHA-256: cb5213899690d61a6ad54b0995ea9136a9cfe3c9f18f4f47ea7f60963ac67e65
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing lure. The embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads, suggest an attempt to redirect users to credential harvesting sites. The heuristic 'SE_MFA_LURE' strongly indicates the document's purpose is to trick users into approving MFA requests or providing one-time codes, consistent with session token theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://coretry.ru/uplcv?utm_term=airdrop+from+apple+to+android PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4b3d5eed16016ee81796986dbb4bd12c/61393912298.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/fixinuzelalisabep.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72642000990.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/romizefoz.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/10028556196.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/19895796124.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/rusunotopukanugowemividu.pdfIn PDF document text
    • https://mollis.rs/files/nanunino.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/93399432871.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2f7639ac---tinekolosodawita.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/febemuvuwewotoxobikozeke.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbff29c8c---dimawinorulesezube.pdfIn PDF document text
    • http://artediapharma.com/upload/files/83089502274.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210911_003013.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/54491323597.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xiduvutajo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/gezanonerinebexafarosuxip.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/99942281607.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zibilibukufedejebap.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1009f7bc---malaramel.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/bewaluxazinigoxipolebokuv.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zasivivojakafevor.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/50371800272.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/gopukekowabip.pdfIn PDF document text
    • http://ranczowdolinie.com/files/kodadisazanusebo.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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10472 bytes
SHA-256: 59040daf414f85d3d92ad6d9acb55b4f5f6995ed9fb175617d0145d405e6fd56
font_01_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16860 bytes
SHA-256: 1fbf0b136fdd3a9336a2ac843f47f5e75902a5fa500cbc6c8938ef8f48fb778d

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