Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8b6be9f38169b3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 13:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41e62ddbd12309d79dc4983067bf657e SHA-1: 2b1500fa793dee551e64996b666e193a094af596 SHA-256: ff8b6be9f38169b380740ea22d70ed629c43271c26aafc98402ef10b2414211b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://synerhu.ru/uplcv?utm_term=popcorn+for+android PDF link annotation
    • http://dylogistics.com/userData/board/file/36167340062.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/41019007361.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/xigofironisu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fulaji.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58909170269.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/9364830582.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/29488549120.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/18380453201.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6521b411da8a5a9f6bd157554e40e33f/dilujajenudimidup.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673840f5a9---bobasozeditovusi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370fec93b77---59782287335.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lakitufokuv.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/zoririnop.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6nt14g4qjk6peogl00mr64417v/kutok.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6376253440.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/19336805637.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/muluditobuwepaginurarevet.pdfIn PDF document text
    • http://domuran.pl/files/file/jugasew.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d75f123600f69f316ffc341630a36e8f/29348452213.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/difidiluxul.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f294edc23---33694520289.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/vebodora.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/80877360796.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10172 bytes
SHA-256: 39901441581ffb4cff405d0b94ba5cf9efb5df6090e7561c020afe679524e614
font_03_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 23664 bytes
SHA-256: 0bf37e5c4edfa177e6603e673822c530a43069be8d8b3982333eec7d7f2ba099
font_04_sfnt_off000148d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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