Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e2f5cbb6799e60…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 23:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: be7bb3754090d0bd5bdee7d11d454a1e SHA-1: e4fca63580ae36ba68a7b6393bdfa53ddb06496b SHA-256: 53e2f5cbb6799e60ad199c451a504be7704a86738905b2ef7e8e59e7612dea89
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting domains, suggesting it functions as a link farm to lure users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gzhangqin.com/uploadfile/files/47383943591.pdf In PDF document text
    • https://xistenze.com/files/files/xejubekas.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/49910815644.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff6bd1d9d---12098655119.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/mojaredulo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad35f8ffbd---632512104.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/49785428102.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607be073c77d5---fofelibivetozotojap.pdfIn PDF document text
    • https://airshow-bg.com/file/sawotibaziwobemofaka.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/68983941009.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/91784368417.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce32813e7---92857997826.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/mexojubemug.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/subedusevabawugefuxupov.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/tezubezokiro.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/8967797243.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd698ec69c---57106327642.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6f76d3b9dc3547486550062f851f04fd/73681627192.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aeb3126fc---kitixulixugovisimasud.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/jenevidaguvuxe.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/gokakifexodadezi.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/9237681157.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/74170420201.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/kosolabokivokebon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kosakata+bahasa+inggris+lengkap+pdfPDF 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_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 17328 bytes
SHA-256: d71e780a3395fe74f3857bfb48d66cfd190880b3715ca658237f6c29e0afca04
font_01_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 11000 bytes
SHA-256: be827f6ba8c6e0c434a9f558a833814580a5ea9609a4b297e840e663822c2147

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