Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfd05a7f73422d9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 22:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5eb2ef1cac77bb5f5c2d6308bab67b9 SHA-1: 3c4a26a89ea20245fa413395dab08e1c9969e569 SHA-256: 7bfd05a7f73422d9d70d1f8069d5198acbacc758debbea5a5e05c4cd8f18c88c
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=shadow+fight+3+obb+data PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f822c92b2b---dawiridaf.pdfIn PDF document text
    • https://defi128.com/userfiles/files/5758247734.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa6ac422a---49901956342.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/352215631.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/giwofirenim.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210907134717.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sinazonu.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/23890618932.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/wamubawozuvopo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f0032f905248d051b35b9a0190cb69e4/foponaniraxiw.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/42342545.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/44870913078.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/xofasot.pdfIn PDF document text
    • http://dalaichau.com/files/44036532942.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/59227935208.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/92261743021.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/84833981337.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cp7kr2q6ffsca95oo4m4d8tqs8/7438467081.pdfIn PDF document text
    • https://windsbs.biz/files/file/migimokavozipubexev.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a9ebd557ca3e8527a789bafa47ec6456/23454055069.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138c79c81445---vipedapuz.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/89443398996.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/neragatisiza.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/66995112507.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/netewelivabek.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/wofavewu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26c8a089d---84134090827.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 17748 bytes
SHA-256: 916e371608b8a19fc2ee4a1f0398c3bc697c5a56841618f9efa4e44761f7ac53
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 10556 bytes
SHA-256: 125b9676eef6418122fa1d45baac252a519235a946f4ab2e41283fc401ca5ee4

Open this report in the interactive analyzer, or submit your own file for analysis.