Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec3392e3b800680…

MALICIOUS

PDF

97.7 KB Created: 2021-09-15 15:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b455fc5fcc51b85076b7403160ff5070 SHA-1: d7a3626219e4382f87f003e7a7f3a52d7f0dc3f3 SHA-256: 2ec3392e3b80068059543e19e7d880497e9f7b27e89fa3d84c7b7f5fa8ebc16a
216 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information, such as private keys or backup codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://garglob.ru/uplcv?utm_term=gradle+setting+in+android+studio PDF link annotation
    • http://tienhasteel.com/app/webroot/upload/files/88257935701.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351fd84e369---4934117200.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210909160346258.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161412a8d59db1---fidipinemuzisemarigema.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/77302928769.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/82045287860.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/rojozegegefexuzasal.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/boretoruwopujere.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/gavuwojove.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/suputodipudajagegevin.pdfIn PDF document text
    • http://citra.cl/userfiles/file/buloneboko.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/86639742056.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/74298242697.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nosiburolusirotuwex.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/61567507750.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/74884384227.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/nawudaxatojazorukoranad.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/55762507048.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lovuwufidisewoledixineme.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fijuwedojaxoxafixidupopet.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/20506714511.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/32982806461.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f406b4f40545277b7a7c7df603822ab/jepipitogogafigo.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/84500728865.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/migosuropezapeju.pdfIn PDF document text
    • 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_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 18236 bytes
SHA-256: 580d72ef3e363db82739692047f271feb9530b5827e1f47f3eb9c657d180560b
font_01_sfnt_off000148c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 10560 bytes
SHA-256: 10b1ee7f4fe8e83e7fa9495426886b05ed83a96cdaa610b286cd6136dd7824ab
font_02_sfnt_off000160c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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