Malicious PDF — malware analysis report

Static analysis result for SHA-256 06270ae51a9b8c06…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 02:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47141caa568f563811207b4be7f382f9 SHA-1: 05ace50329ebbe3c843bc45e34079f76baa8cbef SHA-256: 06270ae51a9b8c067f336eed7bd954a7f16f51b7bcabced0031aa0719c257d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=equity+method+consolidation+worksheet PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dktumpgpvn304g9ojpdaih7fmi/nawazape.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a91cf1728321381255fc00e00e436d43/wunajikalutovuba.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/55769888487.pdfIn PDF document text
    • http://gabortech.com/admin/file/18964285356.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/lenamutazusumetasov.pdfIn PDF document text
    • http://canadanur.com/resimler/files/ribopotija.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eccca24efe78889a18b9d011e89d7626/48865835001.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803658a77b6---89352875718.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gae14lvabuafuf78i6q3tc91dh/gapopowurolozarititu.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/vosexuluk.pdfIn PDF document text
    • https://tarsiman.ee/files/file/mosuvumexekoki.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cuoqm7emtr3pdnbuh70idqku9q/31433336797.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/14767602542.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b39b3da391c---38051204452.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee55a82e1eb---punatokaloluxaselilurap.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be16603d04f---xixafipidaze.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/sarokatunuzo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/189070697b77d30fe48d8bbbf913b2a8/66815689945.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/63de98c693c3dc7d4d46d3f45ab4ea56/85936742465.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096538471152---70472945427.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/75141136568.pdfIn PDF document text
    • http://leguido.net/files/55241048689.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 16608 bytes
SHA-256: 7a8de39cf3eaac2a6b28fd2a6d9657b9b9691911df9a9eca41dca9c837a2d527
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 11156 bytes
SHA-256: 8d5743b50079432951c2aa258286ff0724025a8f4423eb070dcc606cb0fd0be2

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