Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3490ba8b0a47ac6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 07:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5987b9157c68e4f153803f339e54268a SHA-1: 8a6e05af15fea5de4fa4a84b65f3598d16adb62a SHA-256: a3490ba8b0a47ac676bdae185ee01f19b0e106c9fd845d677324df2e82d9e607
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.wroclawmodelshow.pl/ckfinder/userfiles/files/85219814626.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/86555361027.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/kizasopataraxesiropebe.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/79225ff98a62335afb0cda0eb9e3c833/sigekonotitabapejepuv.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fowatili.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4814dd49---80886216806.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vatekasubosezifi.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/puvopajat.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/tusedilebuve.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/redibokajamizig.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/95607826393.pdfIn PDF document text
    • https://luminex.pl/upload/file/vuxoz.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nuxawunidapowizejeratun.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mabulobumidexisawivarum.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/78368149845.pdfIn PDF document text
    • http://www.bash.cl/media/file/39995274625.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc53f37b---juropatumewawer.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/robapigagafamo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kerab.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nafutilemutakazetof.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/99921290891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=forza+apk+downloadPDF link annotation
    • 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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 18332 bytes
SHA-256: f7eea837f6100a9c32476172a79e9c7b962e65f006ace1c917996726366132ce
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10108 bytes
SHA-256: 02cd94b345cf9b5794dea51237d469841c0e6f5ea2d71addf7647a0013c1fb12

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