Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53bc07b075e9934…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9a95bec78f7f5287e374f91413b3242 SHA-1: eb1ab33ecdab8b7182be40ae7fc1d944864180ea SHA-256: b53bc07b075e99341e0cb2294acf779f64479dc745dcdda278f0ccee6253bc22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=big+modern+bloxburg+house PDF link annotation
    • http://saga.diamonds/uploads/ckfinder/files/43666332537.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553592e130---wirosesidodejusisonokapiv.pdfIn PDF document text
    • http://chenruichem.com/upload/files/xexenatajudafexal.pdfIn PDF document text
    • http://vina2002.com/uploads/files/tovepabenu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wuxuwapovatarimen.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/buwototazomisinu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vosesimikel.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613845ff31fe0---62629529477.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/50839010852.pdfIn PDF document text
    • http://amandamaitland.com/images/file/2470786288.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kanuboba.pdfIn PDF document text
    • http://fxlcd.com/upload/file/folidede.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3d9a63d7---41841749466.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/zekalupufasogebine.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fupizomesufifef.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/juzukadafeveloxop.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fotukupevuzulukozivofim.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/747jensrmg69js6a5m4ovca5jd/dekitezujaguk.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/50931255022.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://dnepropress.net/files/file/xemumiwera.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/runojumapa.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/27570982154.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_off0000ba03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA03 15732 bytes
SHA-256: 807197904ea27c873a508b915790c978a50a5fb5c753059742a03bedcfcdceb6
font_01_sfnt_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 10828 bytes
SHA-256: 638a9f066e31893d7356e5b15f1ca9a86d6b10c99cbe5adcdfd28481c3e98d87
font_02_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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