Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd963de27edbef10…

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 571ec38dd2b893c0ccf8477eebe4cd99 SHA-1: 79322765a3a0721d6e893eb017c78f281f024230 SHA-256: dd963de27edbef10bd81f4f138d002d7f13940712d59bcecb7d74f35e08a59db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic to trick users into executing malicious commands, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://toanthinh.vn/webroot/img/files/suwududujaniwugadagufeja.pdf In PDF document text
    • http://xn--eyt274i.com/upload/files/gomajunewenitelufat.pdfIn PDF document text
    • http://canvangdientu.com/images/file/bamibukifepifupa.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/79005979791.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fe43a7558dc87cd1b651814bbceb1c3d/66546096654.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/62357412145.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/taxepovibaxusekalinula.pdfIn PDF document text
    • https://aashianarealty.com/file/1082157642.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/31784288828.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/rijijedabugegebiket.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2795c65e---magadite.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/655fdad1dc874cb94fc5fb48e100be74/67380196742.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gofajolubajevexizexomimug.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610618a25e430---faliwafufinir.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/tivurulesalazezo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/govakokupogiva.pdfIn PDF document text
    • https://tappowine.com/file/61392579120.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9f814907---72401815629.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xolarev.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c152040a4---20958619321.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e1223539---naripalomuropaporoti.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9db6ccdf54d683b5112af882a40b401d/voros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=comandos+switch+cisco+vs+huaweiPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10772 bytes
SHA-256: 9b3fd817bbebce9c2bcd3dd5c6339f42ad5b17ef502c75122721a038bd1f21e6
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 17628 bytes
SHA-256: 935e8ad123574d7423783247806214df4e4f18763c836becdfc92edc4e925d2c

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