Malicious PDF — malware analysis report

Static analysis result for SHA-256 976509daac372977…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 20:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e01a4c53eae9e761690f4a9af3b0d90 SHA-1: 579c011c319bb1d7c7aa52c64e08173d5ee410fd SHA-256: 976509daac3729776c5d7dfda92f43c9dc1ee76993d24c3eb6fac0979c68d5ea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://a2designbg.com/userfiles/file/67802465822.pdf In PDF document text
    • http://ciskmv.com/css/file/58309148537.pdfIn PDF document text
    • https://mkart.it/uploads/file/narapelinorojaduvudadobok.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/duvaguborekowepitag.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/pabofa.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/vetugolajamave.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/16491726628.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/borepefuzesug.pdfIn PDF document text
    • https://kaisar168.com/contents//files/nuzipixaxa.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712aca7bb2---2120240914.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/dapubi.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ce57824ec183a6766e7dbc182faa8e93/zamapifedebusapepo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/88fd8eb8dc71832a4e4f4730e68cea80/weredarolanoribesuva.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442da1f698---60358367734.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vexav.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160753b93cab11---zojatuki.pdfIn PDF document text
    • http://esistore.be/userfiles/file/suradep.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/selitobo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/regabuw.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/temazuw.pdfIn PDF document text
    • https://dukupahit.com/contents/files/82795209969.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ed85e43b---61431831353.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/39860585034.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/jedaxonipaduvogi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2bmme1o3o8glh77k4ptevfpn5n/38495318612.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nebumatigepamozewimefetuf.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/9655571395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reducing+pdf+filesPDF 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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10460 bytes
SHA-256: 9fcb9af78bacd4823ed24048047084c2e110228b12e46b713ec4f4130568b339
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 17668 bytes
SHA-256: c800b3f98faf84410ebf2343db999fd75f378c416629378c23694aed83cdcc0a

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