Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ff3e0c135f760e…

MALICIOUS

PDF

94.9 KB Created: 2021-07-26 08:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c5e5d5ec62d505420e0116bb98b4b67 SHA-1: 31439b23d88888f14de63d93ad66ba5630441810 SHA-256: 15ff3e0c135f760e0f52e1bba15d60403eeed07d0392fbe87e770b6372ee1254
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing lure. The document's content, though heavily obfuscated in the provided excerpt, is consistent with credential harvesting, particularly by requesting MFA confirmation or one-time codes. Numerous URLs were extracted, many pointing to compromised CMS uploads or link farms, suggesting a distribution network for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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
  • 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.
  • 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://billionbosses.com/ckfinder/userfiles/files/midupamesudazusa.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/acb32eae450d92847d7eb4048494a3a5/reforuxot.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/vomizidito.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6ugf2c66dngrsmplvn76686itl/bunovikenebub.pdfIn PDF document text
    • http://zuche0551.com/upload/file/lovesuberakevufunolimiju.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03b4ab821e---42996414478.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8188eb0a8---nibenatosepiwudimeber.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1b9opl0qt63j4tcbh8sl2lim7j/dugide.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50d8b7132---59669023024.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/49972124277.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5c6eebf8a053c778404eacb2992a7bf2/dakagi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27453d51a9---83766293747.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/29321325948.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29f594cbdbb142d986c5dd1496f05cbd/jubiwexesabokipivojetab.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zadogebalaru.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/30916567643.pdfIn PDF document text
    • https://mszukam.pl/dat//file/7974102291.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/47747936335.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/396f86b2315dc1c1241a84c745581097/paxevinaponeputunameke.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdaf59252d---55561239810.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f2b3d42ed---94712204885.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/ralopabitasuviki.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/zoderatanopog.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8dae85cd---52114956896.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mojlnr7k94hutqkht0s1c5uqvq/80889509683.pdfIn PDF document text
    • http://wohntraumgmbh.at/wapibubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+instagram+followers+no+human+verification+or+survey+2019PDF 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_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 18868 bytes
SHA-256: 25a9cfe4686ff52a58ef09c10da66dab7ea04c9a109949b5234f49adcea1a75a
font_02_sfnt_off00014e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 11600 bytes
SHA-256: 816bf44c015da21a23fa815cfb44c3b4f17374e1ef4f1b93da9118a287529457

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