Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2b3c4352e3056b…

MALICIOUS

PDF

75.5 KB Created: 2021-07-03 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8da943db2fa5275f01f4a829809fdc9 SHA-1: 8e00d5575bd481b8cb813f160faa3f01404c08d9 SHA-256: 6c2b3c4352e3056bb6ea2d81cc87a4cc799d2282375eb4de0a8b65ce6ef82e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links indicate it is designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=principles+of+language+learning+and+teaching+6th PDF link annotation
    • http://kcde.kr/userfiles/file/11600395366.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16097faf99301b---vofeje.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/16560962499.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zasuvapukusoweg.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889b582431d---56526539482.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ac105199---laxozoniso.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/xapebagudu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/24877147540.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7tc0kbclu07lri8hgr4dc4dai2/13515944069.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f00d31a47---83851683593.pdfIn PDF document text
    • https://csodamalom.hu/files/files/98416749524.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/wetefomumezakol.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/n8f10rmlggrcb66s27qtocc53j/63282390464.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079798e72d00---lovosoneki.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/48877165432.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/pateriluxemekelega.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344a8549a7---41178367715.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1feb08ae0003628c31ac01fc94b591ea/fozagilijimes.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/29959261241.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/tekoriniwemokexo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a053486e7ed---dimeliseguwuwivebetumofus.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a21cc3df---80104103081.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddd24dbc2---bixigovixir.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c59804c3e---1627514938.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/ritebolutovowelun.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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 11168 bytes
SHA-256: 604043e15fc1b5b3a07226ea60ca812347e02f7e3f803885da2257a0cd8f8586
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 17512 bytes
SHA-256: 331e8ac284121314662766f689a76787d2d7e785a8a8b6631a19331cace374bd
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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