Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f6d8a65b36f4f5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 11:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18a82b3801b84bc3a5fdf1c6057f909f SHA-1: 7f5b08c0e96c194b742437fbdaebefd62ccdddc2 SHA-256: a1f6d8a65b36f4f5cb2021a58940ebae32ed893206359a1315761ec7e78b99c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm patterns indicates a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cokhiminhhien.com/media/ftp/file/25041981579.pdf In PDF document text
    • http://gkz-crimea.ru/userfiles/file/29317445085.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbafc07762cd978329c33e90338d44e/43536347495.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/76336096106.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/budarejaduwuvodirigenokuf.pdfIn PDF document text
    • https://petikdaun.com/contents/files/65918919191.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/fiduga.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/1702071430.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360b9dd3f7f---wogavimovutidakigeluvu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90380695291.pdfIn PDF document text
    • https://tessuno.com/upload/files/6134add559ee5.pdfIn PDF document text
    • http://mgrima.com/files/file/73645084550.pdfIn PDF document text
    • http://www.moyekolodin.com/files/poworovenuvomimedikopi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614359d12c1a0---susufemubasutixa.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/vuragazozulagenifizefixid.pdfIn PDF document text
    • http://afslab.asia/upload/files/41470567049.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tanadezasefuvim.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313a23a47ed---90995280963.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/tulupezexategufa.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jukedorutekedulo.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kuwit.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zimin.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pimuzipon.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90648364949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+theme+maker+downloadPDF 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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 14200 bytes
SHA-256: cad9f090b02fe18fa3886f48a9f9810e040970b4cf55fd2f30046892f7f6bde9
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10504 bytes
SHA-256: ce026f6454397916ba5c6ec2a25ed68566d8bf4dd304b973073b0337bf7b897a
font_02_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1