Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc97c9f5572ac578…

MALICIOUS

PDF

81.4 KB Created: 2021-08-31 18:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8f695bc62b524f645502c7504ab31a2 SHA-1: 597950385ea928af8319ac14b7b8ba55911c6d01 SHA-256: dc97c9f5572ac578ee235eae67d27ad5ed42cb689e62c9d2dae537f0473b46e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'urgency/deadline' language further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ludifrance.fr/userfiles/file/98779238403.pdf In PDF document text
    • https://cornerstonelaw.eu/userfiles//file/25796807884.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/13770756439.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b621c9b6487---jimoliberimomenoloxajizu.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/butalafona.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/40201536974.pdfIn PDF document text
    • http://canadanur.com/resimler/files/91514997400.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/14845197558.pdfIn PDF document text
    • http://ezibra.pl/upload//file/25837291959.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/asq742jd68q7fl945ofctp40gn/75075143702.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/44824916785.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bb59eb67d80ebfe7b58846b2baaecac7/fifuxu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/61749398920.pdfIn PDF document text
    • https://izometal.net/mm/file/zojufiwo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009428b447---66542672070.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795eae33cb4---32405394287.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/21278850877.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/13452549272.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mfb7ff94bq1jnceojot56m4lcb/wixewotugipujakapilu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b858a82a---zopuvimogebuxu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/03f8703c2af0de752c666b334f0ccf0f/54808412270.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210831072320.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbd3813335---10784624105.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622264384.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/aott2pqo52ap074qfmnt051tvd/lunemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=management+accounting+questions+and+answers+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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 17044 bytes
SHA-256: 9082b93098ee2f34846a0779cf20eb6a2ad8daaf5c22e649414ee71e2d122ec5
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 11244 bytes
SHA-256: b9ac7b12f146244d5835429f28142665ad20ca942fbe59590a7cf0cc42912bfd