Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e44161ebffc6a9…

MALICIOUS

PDF

108.2 KB Created: 2021-09-05 11:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2776fdb8ef95c2fd613928c3b3f51487 SHA-1: da7773949799a7894b2a4e08376517b22da95488 SHA-256: 09e44161ebffc6a9b698b139bc88dc5b2408b818c1cec420e3a535867eefe31d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=multi-core+embedded+systems+pdf PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bdd99278---1771787903.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/76893982626.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/takezexidesud.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9ddc16c8de433d5a0fe06afb7c563388/66703456903.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bdd5a3aee---zakajadamosuzuwop.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706e6d7a74b---3423770790.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/51430135626.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/zimegeda.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/39117058493.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/dejakif.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/zibolodiwiwowovisikitib.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bekexavegemotud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968fdc56b53---kibaji.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/47453177288.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/neluxovuxi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d779cf919---70847627037.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/77037294342.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/94574149421.pdfIn PDF document text
    • http://seamacros.com/upload/file/vefologekavuvomejep.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d139097e25---35699814895.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/98064244322.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_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000156fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 10896 bytes
SHA-256: 40b699f0b6282845738e052a89f2df608431e0f06332e70c9e166ed4f295c762
font_02_sfnt_off00017018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17018 19492 bytes
SHA-256: 7dd2e268fa6292dfbd375e21414ba3dda3af3a296e26f4f7c4d36c1992387093

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