Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c2deb345de683d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 16:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81b8d900da89794d0e7d35939a8296e2 SHA-1: 1385d49936a33c1c6331efef760abb38a0f1ccf6 SHA-256: 08c2deb345de683d6ad71d7a6b2d0739024ab7fd97c0ca382ed321ade322ffd6
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6ae3abd0---kosujafegotinozovekego.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/26755902116.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/lisudasuvelegiwejowediz.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jajasiferomu.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lojenezepewevod.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5874129061.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070420246192.pdfIn PDF document text
    • http://vitrine-prof.com/files/66422290183.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1927bc870---70134193832.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/14428707026.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/gojuwixujafevaro.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/wavuzemabafudoloranatito.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/11833542366.pdfIn PDF document text
    • http://bushurov.ru/images/files/bulekenopinurujalifuniz.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/jezeniviguri.pdfIn PDF document text
    • https://sapporopools.com/contents/files/98617515126.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d4ed1f74e2d55f88e4b941a8f02e9dcb/xilixigifotivojikulevute.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fetevulosefided.pdfIn PDF document text
    • https://pokereshop.cz/data/file/36081189486.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/povutitogegabefoworagureg.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/78977462997.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/melobomomurosozabe.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/74963253201.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3c6502254---5340525655.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/fezokebizusitiloriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=front+camera+not+working+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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10656 bytes
SHA-256: b3865e881c24d990d42a6fc13fc8f62f806b62e63046e885e0da55d6bca87e25
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17580 bytes
SHA-256: 4503ea2976d5c2d4a9a41c85135a9d67f7ab5df273c6fd55c28bce04b5e6e0a5
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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