Malicious PDF — malware analysis report

Static analysis result for SHA-256 43667d710636beb3…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 23:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e3f5ce12e77f2a0741f270bb47ce367 SHA-1: 9018863174a57cabd8704b87cd07fe5580154acc SHA-256: 43667d710636beb3a09f36f1dc6c1cd8c4ae110e52c8a5c87b71ee70730287e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://footstepfloor.com/upfiles/files/renovaretakefelumite.pdf In PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/pumudo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a0ce9158---70027469734.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ea60a8d6---76875633983.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143898f756b0---pituvix.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ufqqdaru8oksgm2u91s6ogdkld/mukurazirowiwosevur.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/41639373629.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/93628785650.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/lixofulotexifowi.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/65797507018.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/29813572830.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/zitijapijonipexupo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161401018ae259---godorojomitubexini.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/sibaletukusefuxaterires.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zejimot.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vinegiwis.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/52932975686.pdfIn PDF document text
    • https://italvaping.com/file/pelesosoriwapezow.pdfIn PDF document text
    • https://fishuntpesca.it/file/jovamoxadoxakotizetoli.pdfIn PDF document text
    • https://domilot.com/uploader/files/dagajape.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/mulomutodex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=object+oriented+analysis+and+design+mcq+questions+with+answersPDF 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_off0000adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 11556 bytes
SHA-256: ccd6c7a595245fa97783996adec9dc71abae79c230f9737aca4e4b679c2acdb7
font_02_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 16244 bytes
SHA-256: cce2dcfbd71b86f2024d9d0182ef111c5b82f54dfc44752a227b23c244cfa1e8