Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d93d366c070d973…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 15:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d72e0297ded79e6bb203836d8886eb34 SHA-1: e688352c8a083f4db736224625f77587bf5445e1 SHA-256: 8d93d366c070d973668b51cdf23c8d50a71b2a56d6b40d3fa855e3be9d66b870
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a fake CAPTCHA lure, a common technique to trick users into executing further malicious actions. The document also hosts numerous links to other PDF files, many on compromised or disposable domains, suggesting a link farm or redirection mechanism to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://ysh.my/userfiles/file/kifisuneni.pdf In PDF document text
    • https://waxparadise.pl/userfiles/file/21472890169.pdfIn PDF document text
    • http://chinalabware.ru/d/files/joposewu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcec0e08c---96140657504.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/begisapigurovalotamubaw.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lubosipobufusitemakafa.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/tosopogunobalezok.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gejamolavibaro.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fd70179b9413d00901381b17d46dc269/40013842504.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/55174630146.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bikixe.pdfIn PDF document text
    • http://k1a.ru/images/files/file/73062104238.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/54261253644.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/3271838863.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/nilujanubu.pdfIn PDF document text
    • https://eguiders.com/uploads/61307818743.pdfIn PDF document text
    • http://trieuduong.com/images/Download/penagezobal.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/70687474041.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/riturajilanukumubijekaj.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/40297315315.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613ce9f267---kikafore.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2b489d9166278be70e648dbf97baf80a/78471142802.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gafolojivarewumujebamuka.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18708098389.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/90521511543.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_23D6BFE5BD91C968.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/genafor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=alexa+in+redmi+note+10PDF 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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10500 bytes
SHA-256: d5f600213471b6e5cb1066b39c5993ec38ce6a4693ce89307323bf328764d12f
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 19064 bytes
SHA-256: af869ad93b93c4ff59f538d198b465ed4bdc3dd48c94b4e3944b1403408d7ebe

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