Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93ff3188f0c1ca2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 21:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e38b740f37e81f53b6c0f85ab13e061b SHA-1: d731b8257113ddbdeafd0caae4da52e567628f95 SHA-256: e93ff3188f0c1ca223d2d31260c4d52fc938c00442e11b629bdf0b46987c1cc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to link farms on disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to leverage search engine optimization and compromised sites for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sake-tori.com/images/library/File/jilumidajodojufuludotib.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/25176376686.pdfIn PDF document text
    • http://iknow.pl/files/file/vavaretet.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/pixuvawekedaponafixorukeb.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/40450850868.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/kefaxepasakoseku.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/31158470680.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614287fba75d7---kosiselofusera.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/xojizisuwufilonuvef.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210915_091900.pdfIn PDF document text
    • https://n-tlg.com/files/file/gasurodusidematidukonon.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/2964985338.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139861a1b676---22760049536.pdfIn PDF document text
    • https://lecachet.fr/docs/files/75841988622.pdfIn PDF document text
    • http://a899.net/userfiles/file/ludaparilesaxukadegusojes.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/44736129305.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vorukiranazaxoxam.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/19803142335.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/47654070375.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/wuboraku.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/vifunanebebenepatasedor.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/64894474185.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/darotis.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451a037870d---60545779045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ludo+king+apk+mod+hack+downloadPDF 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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 18152 bytes
SHA-256: 7a161826460cf099aebfe489410d80d28585a598144196adb94a5b4c9ee7e218
font_02_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10696 bytes
SHA-256: b7c5823058df48df2a8d632a431a409bac93ef2b22258880e97838addda7d624

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