Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ab923fa251315…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 14:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 772b26ae8f100a7bc90816441f174f62 SHA-1: 1e44ff8c0a0d048d390a44a48089505e0aa425f2 SHA-256: c75ab923fa25131577203b104bb748d9329d0b9b6b0706cfcfbf93f8e2e6219c
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely executes malicious code, and the link farm serves to obscure the ultimate destination, which is probably a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pirkitpadangas.lt/ckfinder/userfiles/files/30397398512.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dab035ae6e720562d7faad6e2efc119c/43352836685.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/31663077457.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/68265658892.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/82967898200.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/difejate.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gopopipabelupa.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/kiwawoxukopogunogeso.pdfIn PDF document text
    • http://humanlitech.com/files/files/xumaredoxat.pdfIn PDF document text
    • http://tchid.net/userfiles/file/xugebirepopefajoxufixexu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f442dc1dc---vizegaluxabepejagiba.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/tuvulalikotezagojedota.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/wibebij.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ede8de15b---kilezufa.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/96992119568.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/22097303719.pdfIn PDF document text
    • http://att-na.com/upload/ponaxawol.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dutaxiwefufivos.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/84281828594.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/71553029797.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/wefumewowakalufuve.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/67544254122.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/22310299367.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/68aed2af2407b7c5ce56d5fb85c1c7ee/xupovarifasoxigubujixujev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=auto+delete+messages+androidPDF 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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10672 bytes
SHA-256: 075ecb6d95c2a507a9a995114b2bd8a5f4fb3024683d324394a97601e0e84f1a
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 17564 bytes
SHA-256: e60a062c5df80d3deffa33f3c84939658eca5f7db02449d9a64d8e75a5ad7b5c

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