Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddac3bee4828d6b2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 02:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1bd77981407a2282472fcc4a4cd9828 SHA-1: 471cf73a0607dea1d56a07282ed0c0e35e4dd74b SHA-256: ddac3bee4828d6b297a160158718d1f2ab8875bcac3dab1ae981ba828dd867b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=endogamia+biologia+pdf PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1b9b81be9aec5462be168a926600158/73399572648.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/87188016887.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/newufofobome.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b4aae55f6b0b329922af1bec35f80279/80423828199.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160731ca77a08a---gimiga.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/8191057345.pdfIn PDF document text
    • http://machnhaduong.com/images/uploads/files/30065683301.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/67949723368.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/jegudijijug.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/fekikuraripeboluvenuj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82db03a2cc---14854215465.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/49114292533.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/72669385455.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0967e9d116369fa574e1d263f1a39cd7/14971861263.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/wuxebuja.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/72908583083.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/tezisame.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/mekogapetiguvib.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nejesemixur.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/kujasovopifugirivirivinu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b0a85a54---91072332297.pdfIn PDF document text
    • http://armanetti.com/images/15655883238.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zuzuvosedas.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/zijefexamevopogozotalon.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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 14732 bytes
SHA-256: 7c2e8945c87a4f35aa523c1ab7aad86c0d882ac13e2665ea510515a26ba47f86
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10468 bytes
SHA-256: 6220295e549f5ec9727b2d347b3be94662ea434dadc9f8f59bd809fb50c4e525
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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