Malicious PDF — malware analysis report

Static analysis result for SHA-256 97115c7b1b8bd6cd…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 962f088d3a67ab11478d2ef0cca2764a SHA-1: e241a749a84f71c1f7535e35dd30f8ee0d5612b3 SHA-256: 97115c7b1b8bd6cdee02e144b520a49599f98b1199ed2b47359c99660ef2c7b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/babizozuzik.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/25383385635.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62d8b9f02---25300050780.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/21369014658.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/10gu46p3akgp7guoo1ua57k7j2/8026387578.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vujevupowutiwoxogabajado.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1de762e4f2d64b54786c457f90c8e0df/25931497034.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/79034936035.pdfIn PDF document text
    • https://cncunse.com/d/files/lenujesegemolojabop.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zoguvakaduze.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/subiri.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/515dc71cc521531f90210e0ad9ebdd17/12280791985.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608749ed0a41f---xubujeminutologi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kamejem.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/22898437156.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1add6b1ea---5291271083.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607767f17d542---23481379942.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fc52f771121446be9366be2421fb5fa7/58209004809.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b2ccf4204f84863d2fe1b102e9ba6864/bamuvixux.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/pigezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aubrey+plaza+in+parks+and+recPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 10776 bytes
SHA-256: 1b4910c8afe3b4ba95b93b85787eebfb9ef03b2aff6f8e93840a7a826e83803a
font_01_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 17768 bytes
SHA-256: 3ac064bcdaf64e1bd833ed7cfea98642e4e9a1a51f31c84664a3783e94da11fb
font_03_sfnt_off000146b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B1 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27

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