Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4b8da024185522…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 09:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a4203ed8526dc5ef892be3e569905cb SHA-1: 23237b9b3b619648051dae62d8741a52cbe84977 SHA-256: 9e4b8da0241855229053ada3380b95b22de45cdf5b4a17ab881c8aa5c52ed38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate this is a link farm on disposable hosting, with some links pointing to compromised WordPress upload storage. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=sims+4+expansion+packs+free+download+windows PDF link annotation
    • https://mamadona.ru/ckfinder/userfiles/files/64122827454.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/50017982237.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/tofebid.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/suvapuzoribepidotuzusa.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210916021202.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/dedejotimur.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/97010242870.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/perixomubusoxawuvet.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tasekareboj.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93bd0871d---wuropofow.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dujugibo.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/29050336220.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/fujabek.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/tegozigafawozimubuvajez.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/35548734722.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/77852146633.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/juwisekajuruku.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ert3p7e7brru29k0h2scnicih3/68868712305.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d34dfb136443c9360b8dce8ea2b7bcc/zirekakewisefipojumofafab.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fanirixorop.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/74547260133.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/70430414089.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/11178201075.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d429i0q76t2v7849b5r2dhfiq5/wikuxalab.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/tuxafunaneno.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161442ec3920a2---wufobexafebejizaxo.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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 11116 bytes
SHA-256: 39f8015ff8934481dba0443d5bd04dbc3a6b13141225c807658770ae05deb525
font_02_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 15496 bytes
SHA-256: 3bde52c57144b32ed42a398bd83580e5846c7dda65c2205278c21b74c4da3025

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