Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd93eec58dd1437…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 22:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4ef3ad74b24efc95318b9fded18a2d5 SHA-1: c6d5065f3fc167b032a87f571d1808b4cd411227 SHA-256: 0dd93eec58dd14376fbc9dff0ed0027b704ea52c7297579785b860fc5309954f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malicious content or engage in SEO manipulation for phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number as a lure for callback phishing or a tech-support scam. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://karinbentum.nl/uploads/file/93384813965.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/sokewebefezejira.pdfIn PDF document text
    • http://jsdarvin.com/files/goxifex.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/dokutifijajiliwulemixa.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/ditibuzopadaxeruguzopo.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/zewejavimedenusivak.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/95166584145.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n9auvsusdg4onr7k8f2jvp1akn/57775611316.pdfIn PDF document text
    • https://seerupit.dk/assens/file/74458089632.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/18886508765.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15330646697.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391af7b4d2f---jonolapitefisofapovoto.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8da0ac0bb---53188462369.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/13917202143.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/19107206374.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/30254784563.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/67733181841.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jogozux.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/4237565568.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dagusisiboworonizozezowep.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b2d87b97---vematixinisolemobazomo.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lezifosasokidexalo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d68228e40---xavilano.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/24778975922.pdfIn PDF document text
    • https://ratosatu.com/contents/files/16637366648.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/76616959551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=discrete+mathematics+with+applications+4th+edition+solutions+manual+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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 17564 bytes
SHA-256: fcf65cd66799636fb58e67f8e5d866f4836fcd0499cb9cd4efa99dfad3ce1ee9
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 11148 bytes
SHA-256: ed3f470360daffb110498bc43a5da6f80fb8f3d8c5c92de475889bbb41184a07

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