Malicious PDF — malware analysis report

Static analysis result for SHA-256 23910e6dbf5fa868…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 08:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1104d402048c0fe0d34e78a6dcfebeeb SHA-1: 72f715829bfac4d551783b1d204e7e6750077558 SHA-256: 23910e6dbf5fa868db976c20797d3e754108c676e93f350eace61b6be77eff59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing. The document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=final+fantasy+7+para+android+en+espa%C3%B1ol PDF link annotation
    • http://studiotecnicobergamaschi.it/userfiles/files/45335080393.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0ae88b49---46616577440.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/71381132518.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130fffe06501---nedif.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce4c05219---7165035901.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613362cea8d19---pilotenevokedepu.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/41105417415.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/podaxini.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/muwajakalijedevexojofuva.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/49584866181.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/44682116660.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a97919c1---16196528985.pdfIn PDF document text
    • https://angem.fr/userfiles/file/dosizadugamiwi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f474e146a---fipale.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/toroladivasanufadix.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199185875733.pdfIn PDF document text
    • https://tmtteks.com/files/24174990288.pdfIn PDF document text
    • https://digireg.es/upload/87310261273.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/14259149df4e5d1216845d2f38878389/lidinakokiwejalupolunuw.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/komobirulas.pdfIn PDF document text
    • https://kiptep.ru/file/34553986054.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/mabazexogazefiguwatiwow.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dba0de84e28e6244e46dd88e220836c1/63699736164.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/55216534901.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 19028 bytes
SHA-256: 9ee914e3114c40dd48fe3e98e069ad6cc33d0ef777fde9771d4d4ad2547d9839
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 10840 bytes
SHA-256: 2f1ee9031d0504ca51dfdd34e6eb56744299dcd0fb76430dbe763932b4b50b3c

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