Malicious PDF — malware analysis report

Static analysis result for SHA-256 429c7026caf57ab5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-19 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3e1c20d409c70ba22c4b89d2313cffc SHA-1: f1c57ff987f37b9ca131657c19267e53f53363e3 SHA-256: 429c7026caf57ab5c90a1f93b8c4dc6c369756d004ad7a69f9edc3d24fbaf5ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristic firings. The PDF contains embedded JavaScript, which is often used to download and execute additional malicious payloads. Additionally, numerous external URLs were extracted, many of which point to potentially compromised or disposable hosting, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://emtracing.net/userfiles/file/98050469176.pdf In PDF document text
    • https://newcar-rental.com/uploads/files/202109181609241220.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/84402220768.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/87c1c1576befe4c782ccd0273068b469/xudav.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/98657581785.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/55218047641.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/33376328259.pdfIn PDF document text
    • http://js-space.de/userfiles/file/21836221202.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9gu8avg19ckr6tekslgp7t3vlj/biladavizip.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kepej.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130121e20bfe---43833443388.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/xoxob.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339447c1120---dijegunomolimukezabo.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/52592618618.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f943d105---wusanunolugodufepasojatu.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jinozipinumavefatopufise.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/wurajow.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/89950881436.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nefig.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210918055128_588rkf.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/zubafudewuv.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/nujefekedame.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe3410b0b---zabefemuzajovexap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=life+of+galileo+brecht+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_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 17404 bytes
SHA-256: 6e915793e67e08c929563c9be5417720777d3a2118602cd16448b01af817b76f
font_01_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 10724 bytes
SHA-256: ed163c7102481736c44170aa6bfaea367e1dd5f49f4e7d6088458aa507f67519

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