Malicious PDF — malware analysis report

Static analysis result for SHA-256 16997928e0293111…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 16:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96467f3ec8bda272a7dd64daf069b6bd SHA-1: 99dde0fb262409cef46177632733523f9a336e19 SHA-256: 16997928e02931112bfb9385a112fac1416874e4498b37e57011fe8ba7a98f96
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, with several pointing to compromised CMS upload storage, indicating a likely phishing or malware distribution attempt. The heuristic 'SE_QR_LURE' also suggests the document might instruct users to scan a QR code, further supporting a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://eagleegg5k.com/ckfinder/triplebuserfiles/file/78580477697.pdf In PDF document text
    • http://domki-kopalino.pl/pliki/gudofozotizejosoxedijerov.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/jokilozezadojujilizuj.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/goxubebow.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/sugepuludogi.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/39359540891.pdfIn PDF document text
    • https://novsport.com/content/File/89673614876.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/15658717976.pdfIn PDF document text
    • http://gewald.ru/content/Files/45853056255.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_828364FAB89EDB4B.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/najafasutikusamulev.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/27023353766.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jusamigitobaxepigerasefu.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/50292285169.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18f5c159d---66137085471.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/metesezagirirape.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/31640152252.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/67186358399.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f153780009---jozuxutufejavopabosativo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/mugonewoxusida.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614591cdde7a3---kirewolanabumekog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lector+codigos+qr+apkPDF 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10736 bytes
SHA-256: ab42954b9da87f8a221af6f79f24964b074631c7e666c8971405f99b5467cf65
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 19068 bytes
SHA-256: 9585585028aa58e61f91c51d328fc25271d76faf2f2a21746e4237e4c3c374ec

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