Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ebdf3b1128beda…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 16:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e40c5d5f8ff69fcb36f29b5e4a9ff775 SHA-1: 83c675a5440b9dd1d6227c01ba1447753ff70051 SHA-256: 40ebdf3b1128beda0f9ac3e33693ff545d494cec4b862c617b5459b65019b9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of these links and the overall structure align with a phishing or malware distribution campaign.

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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/du7ls36a9jif3lpva5dmbgnurr/17917511740.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/lepenepikijigubinefewidi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4182605d5---85426803151.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/mazapozavu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zuruzetunavazered.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/vojaxubesivatenoj.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/23052518145.pdfIn PDF document text
    • http://nessium.net/userfiles/file/samedaduxa.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f6cb4eedbc5---numijotodo.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xopeniwumalojefamikav.pdfIn PDF document text
    • http://laserinnsbruck.com/static/41601653618.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d718dae0---78005297220.pdfIn PDF document text
    • http://beateromer.com/bilder/file/15340958706.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c48bfc5e9f---63403439549.pdfIn PDF document text
    • https://hssanesteban.cl/files/buseboloze.pdfIn PDF document text
    • https://everestart.com/images/stories/file/sewiku.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/14483894636.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a60bfc7---kitup.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b87f44bd6b067edcefcd5e6d65defaa2/letuxuzimuv.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513224258957186.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bavomewulenokumero.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/vibumavudomimosil.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/sotudijegusafidagatinu.pdfIn PDF document text
    • https://kopari.hu/files/file/topawalovokosekivawoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=balasevic+knjiga+pdfPDF 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 21004 bytes
SHA-256: 4f7ac79760e1ce5d3316b1d4c4a14ef7a9e09e50cd35d19bbe966b2e1035b746
font_02_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 10816 bytes
SHA-256: c9540268a4c9fbb187efe0db9ecbbf672505825dc1940fe97d467c4903432d92

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