Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5f9ca1fe466cd2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 14:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 494847bae0b791198e6f0a08e86a41d1 SHA-1: c192fb9ee19bb0d0ff7fd2746e44f0e461385bdd SHA-256: fd5f9ca1fe466cd23c8eea26cd5ef95f61d30c80e6b452ad871f00152b016f39
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm for distributing malicious files. The presence of a 'password-protected archive lure' heuristic indicates the document is designed to trick users into believing they need a password to access an archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=fifa+2018+ppsspp PDF link annotation
    • https://wcfkenzi.com/ckfinder/userfiles/files/wowivajopusuruni.pdfIn PDF document text
    • https://cet.sk/res/file/diwukimekexiba.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/d8cc1c4218ca208a8787a033a8b24dc5/zazemisapanaluduwizezodu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/meperewitikezezabeki.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/40268280178.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613721ceb4ed6---zozuxegekeriretorov.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/85374478700.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jemudefuxazijesu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/nupabu.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/51634980267.pdfIn PDF document text
    • http://koutingchina.com/upload/files/80129848948.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137986d51fab---kitujulajubugax.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/dazazebimunaba.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/99418423803.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32f28e276---baxas.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a370e000---12827954225.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gurinawefofudivis.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jizezopibetetimesakebikuv.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kejafovezuxawivegi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4t8obafro0uedqm7vqkpnp2d7m/kavibimuvulive.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kenosomexovusawetusokon.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/polibikaruvoguvawimox.pdfIn PDF document text
    • 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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10232 bytes
SHA-256: 59acf3e24805c15cf3a7b9e2deaaaaab30efefa9c37239b1a8148f8717f509b6
font_02_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 18672 bytes
SHA-256: fdd0e9341ce837600ca9b1f6d8193e5576180c1dfde62282303565a1956e8d3d

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