Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a81d2d21d133f3b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3053b13b0ac5b78f7ae558d6a589fd55 SHA-1: a1b323737165bfe11196ee1cc7af757b3e194f58 SHA-256: 3a81d2d21d133f3b1a27886ecdcb29496edfd05ddb7469ad68dcb540cd587ae1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. Heuristics indicate these links are part of a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cf7706b39---tilezilulemipibo.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f896e655d---lobowopabowekarabadeka.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c734dc7ed45---595871795.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/79763045567.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076418a81b2e---vasufutowi.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/wovawotekum.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210731204552_itie03.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/18182554046.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56423b541---wulumabugebaneguboroxir.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/59594484020.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bfd40a10dc8dc08e3a8df66bf15ef49e/zeleradimib.pdfIn PDF document text
    • https://bamor.org/userfiles/file/3706763651.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b45a31d57c2---75448375976.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184b2bbd43---wenoxekodonerumakoxizupe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e06c718d14---wukudilalesunijejajukuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611131f02c06e---65421191343.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/funotiduvogolozi.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wigetuxidafumalelazimutet.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcefef061be633782f2c64ddf5244833/27857869716.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/57962510073.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/44540547549.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/97812367455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tecnica+pianistica+rusa+pdfPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 18788 bytes
SHA-256: 775904cc77b8ffec4d530bbfa88c54154b89acdd21e2c54440e493ac2b39eaa1
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 10508 bytes
SHA-256: 71a10f6d6a5b1038ea3d383c1e7e1a1fa89520b12e1a5cb7c86e0e819df67617

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