Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c68c4ec2b15153…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4426a5cea196bc4ee39264351a29658c SHA-1: 7c59605340a545d35e2eedee6847a114b9a4e8ba SHA-256: e6c68c4ec2b15153c6c9f5f39a0f913c7a8275a5a33e3739192ba57d302c867c
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised WordPress sites. This suggests the PDF is designed to lure users to malicious or phishing sites, potentially leading to further exploitation or credential theft. The presence of link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sahcarpets.com/userfiles/file/15937300955.pdf In PDF document text
    • http://mediedil.eu/userfiles/files/72491590854.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/8160782455.pdfIn PDF document text
    • https://labelmarket.eu/data/file/naledenevetibogefugiz.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/48490466029.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905154831.pdfIn PDF document text
    • http://adriennemason.com/assets/files/95879641019.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906135745.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/lizidusugoweponerik.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/11990978454.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xatosogedinopotedidoje.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161421fe964fea---nalup.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/92018880995.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/47480386584.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161431621d88fb---57040112666.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161439c9fbb34e---24528554623.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sutaxusunaturokujum.pdfIn PDF document text
    • https://tarsiman.ee/files/file/filutefomakefebakebidiji.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/43020143414.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/46514535791.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/65942436812.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/36784152985.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045f21a951---24564165163.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917065233_3xl7xk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=auto+answer+call+for+specific+number+androidPDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 17996 bytes
SHA-256: 0621fb2d6d9753df0e744d401118bcdaebc529664bd50bf2e72bf8127a87457e
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 11088 bytes
SHA-256: 84d4e3cca543974dc34c06854a77d8ba929bdef5c81ff917df9f2cd9285c5c19
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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