Malicious PDF — malware analysis report

Static analysis result for SHA-256 5781403b0249b39d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 14:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7a718aa96d8a0e3656a65488ac00969 SHA-1: f9d2826257c8eaa9d6482948de43a299fc84e301 SHA-256: 5781403b0249b39d76c5f0287f6f54a8b435efc9953b8ff26ee804b377e2451d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of `utm_term` parameters suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=charged+off+debt PDF link annotation
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/70977039817.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160863217c3ae3---34693805372.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/boboxukakuwi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/71104369643.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/9346061287.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3d0176bc08f8e9bedd4b277b4358904b/13527924403.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/d0b779def79598267546dec5d23b266f/fufakujase.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/95468862169.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/91528371255.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sipimodu.pdfIn PDF document text
    • https://fallsplat.se/file/97317571747.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611c93b3a5c62---lajatipalog.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161189e7710dd0---9410191054.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/89471553948.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5d8b638b---vuparubewewupixazo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3e1f68d16---wexed.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/82635699328.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/kigej.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dfece62c00d2144cee88b3a91aeed108/65078542722.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lodl31a94e4002d2r7lhsihfi8/nirisudasoraxasazuzisulup.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/mozukusiwarobatebegiv.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/95394781918.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/20134106270.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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 17920 bytes
SHA-256: b16c409e43137f9252ddf791f47141c728a706eb84edb042b434f36e3ffdda08
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 10392 bytes
SHA-256: ff09c0c6839f7b5db634fe9815804e36f4ca8722b92c8551598ed022e28f00ee

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