Malicious PDF — malware analysis report

Static analysis result for SHA-256 977cce074ee56efe…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 17:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25ef9d08b0e0cd1f6f44679f3f4ae94d SHA-1: c03688678454fea1db68c1f48ae482eb1d5e821f SHA-256: 977cce074ee56efedaa5504f70360d2482f078115bf0807b24dccce5f8989c72
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qkon.ca/images/file/ruxoxunajuletav.pdf In PDF document text
    • https://weishinclinic.com/uploads/files/202109060707447257.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/58751900604.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/29122542033.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56793602859.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/54217605468.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/migosufelegiv.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/dokerit.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/kokajiligewokajejeraxes.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70722873---14006468131.pdfIn PDF document text
    • http://crm333.com/documentos/file/55018629374.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/86032213666.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/80280515475.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/wazomogigusupadudik.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/85826531034.pdfIn PDF document text
    • http://olympusflights.com/files/files/migegugowiba.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134d80a0d4ca---45880653993.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec9153c19---jezefaruzexeni.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/tudapokuxivapadadaziza.pdfIn PDF document text
    • http://irollee.com/userfiles/file/1491224339.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/pepijupexurate.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/98665962392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clicker+games+unblockedPDF 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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 17748 bytes
SHA-256: cca703f72158a7f8351a49b7765343c27ce36b36c15f7c2c3e097f6a70e055fc
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 10980 bytes
SHA-256: df9420bfb24d24d285f0dd1c26a5c2276d58ee4cceebfaa694d3919af5e15fdb

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