Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd421eb0f1cd2031…

MALICIOUS

PDF

81.7 KB Created: 2021-07-13 22:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b11303b05dc296ff4d90aea81d756102 SHA-1: 8cc19cf0555da39e0fa7b6ac4b3dc5c5871d51a2 SHA-256: dd421eb0f1cd20311af1141e5f697c45af5374ee0b59da97e87eb8bb005b8e61
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The presence of UTM parameters in some URLs suggests an attempt to track user interactions, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=foot+orthosis+for+cerebral+palsy PDF link annotation
    • http://thaoduocvn.com/userfiles/image/file/wovajunaveriwujekokoti.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/14805298856.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa69683a5---dogolukogazudibenaloko.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6e2e4befa90b14606902e074a914b08d/70786661355.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a315888a---46243152378.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/52554984235.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb9408dfe---fidebajigolexusax.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7006cbebd1054be5fc37fb783463ad7c/kasilubavukepemotip.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4997b021---86228070648.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b0e42a4c8732918af0bcf1a7011d7c15/rowiluxuxa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074818447d3e---jodukenutumerulinoma.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/017bc06rputekibhtmkei8jo0v/woxizo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8316ddbe851c438f4af2978557ab33ed/27903516629.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e5855af16669a1cffc4d738d73f5e82b/57598988095.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2288441437a942557145f4c87c2bf02a/74530378772.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/garovizozosajizoruzekon.pdfIn PDF document text
    • http://01host.ru/userfiles/files/65834088626.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff83b193c2---78566799395.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/fejekoroxewukaroxanovifud.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/dizisajodakusodit.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/55482495063.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/23773236744.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9086976d59733373aa3e8ab895a0102b/22098360550.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cfc2b33161502d3259b43d4f2b9c4c93/44293239760.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07956fc58946a7bf6d4e1215b367a5cd/45234314547.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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16572 bytes
SHA-256: 101c66a7e945ce0a3c30cc3373ca4d3edda31434c0b2dcefc470fa80c8032c65
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10704 bytes
SHA-256: b522085280e02dcc4b955bd44a4f82ae39a93338d20641baf4db57f3f414f078
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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