Malicious PDF — malware analysis report

Static analysis result for SHA-256 2440c5bd11571811…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 09:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 29c5ad4aac1a4e3ca0f5dbf74d1257d2 SHA-1: 5a9e5602b3c3fcb72478a8ae98de8235206fd105 SHA-256: 2440c5bd11571811b9a7ff5ca03f28bdc4dd775226307fd2636b283bfe4e1c0e
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including an image-only appearance and clickable action triggers pointing to external URLs. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=zero+go+movie+malayalam PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0cab15212ba2060abc0c701bf5ee6113/24571878431.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/9092873689.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a05be5db55---86730028668.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/silonisibazarafuxuniji.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210924211334.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/xonalobetiwigitibobo.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/88776298099.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mefokeb.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/kowimodifoluji.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/toxijusilepotebomadilug.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/69468611403.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a103a6385d---85131946262.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/nodafixapubuludimakud.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xejabapededitixemew.pdfIn PDF document text
    • http://grabnerestriche.at/sigam.pdfIn PDF document text
    • https://biocoils.com/img/file/waxepixekoviduvododepux.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/34588762873.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/89056639248.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/73870175022.pdfIn PDF document text
    • https://podimercrm.com/img/files/75809645944.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/30246322604.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/43979825200.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/wigogatanunigelubajaguw.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/97936563.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378c04a9524---1187178217.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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 14516 bytes
SHA-256: dab62d9482865dd27df352e70fc229f36e4f49711cb01073bd0638246edb8902
font_02_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10224 bytes
SHA-256: 69a87445110cf4a650f35cbb254e7018d33bf767ecb82a0c5b8bb5b989e5962e

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