Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd36038761225aee…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 06:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21eecafb5e8b71d3c2d33cd2a6943282 SHA-1: c34cfd589082ca988ce54c60a05d92a45781ef1c SHA-256: dd36038761225aeec0e32b17efa3ecbefa1f8d2e94d2740bb78673a8d0839f18
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The 'SE_CLICKFIX' heuristic suggests the document attempts to trick users into executing commands, likely to download and run further payloads. ClamAV detection and ML classification strongly support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=fallout+shelter+save+editor+android PDF link annotation
    • https://eqonetech.com/upload/userfiles/files/mixakozumuweguwotub.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/momubefunosigedupetib.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f0348551---tagivodoxo.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/3507986946.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gobuvij.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/padomisijomijujatasodasej.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/fepimelivifan.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jisaralewelopadixutukeno.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_6DF3378BCEBD8CEB.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/lokuxutodinuzelubadis.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/xozefunarigamesejunabo.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/57458832434.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/95256963958.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6a41079b---15660564945.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/bozilivenafir.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/bedojesexiv.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/folagisav.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/saluvonebofoxalo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109071942075721.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_1147EFABF683487F.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/101203758.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/18194551806.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0b87b0787accb387e24e56daeaa7d2da/figetegapodujeguxuxi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/89772286388.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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 21276 bytes
SHA-256: de367aa32e4de2dc8e89e272109ed3f03c94e6ead801ae7e39692ef9e72db2ee
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 10488 bytes
SHA-256: 4c98e266ed4e13d16ba985a2f6ed52fc3e5f73c3cfdbdd1e865f2dacb57121dc

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