Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16a28d8204d15d2…

MALICIOUS

PDF

70.1 KB Created: 2021-06-21 05:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f75efa8d14853602b18a981b31059d3f SHA-1: fa8bc1a4f6a6e6d6511c197e10732f09eb6a4081 SHA-256: a16a28d8204d15d241ed5f248bce88537368f47b2936888dcaacebc131158f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised WordPress upload storage. The document body, though heavily obfuscated, suggests a lure related to 'the invention of hugo cabret online free', likely a tactic to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/csu6ip5qti78jgcnp0fefoef3b/95730017825.pdf In PDF document text
    • http://cz-synergy.cz/data/file/baviludexawa.pdfIn PDF document text
    • http://elitvorota.ru/f/file/wovokilobevod.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/mononelofijomin.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/40399302912.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c30e70b8f5895c0d409c0530b0373ce6/62116014995.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6daee18bcf11a37d7f39a524543f8474/jekozaziw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/231620119880.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a13d9b08---masefefomunarexifisu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b216d99badf---jezunozotiderubotilorumef.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074275981490---zixufoxubatetoburutere.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/71154397178.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd151c7a71---gamomapefodafesitojoga.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/22016876784.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/tedojodabewisu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef99209d9---23361782658.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jolew.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609150fa4b720---98333462944.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/bd010f7fcca7b0c040684e80de70c140/97370844580.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607670d932f8e---rejukuponiduromi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+invention+of+hugo+cabret+online+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 5112 bytes
SHA-256: 6993603d53646a7f11fbc382114e774ac70e600fcf69816c385d9866f3e66ed2
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 12424 bytes
SHA-256: 516e0e9bac38e0ce536a4e24bbdb624577eddecfaee98fdf65df2812a5cc2fb3

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