Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ca11091e094199…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 14:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 273ac994a060b6ad677bcc2f1880d6e7 SHA-1: 1440eea6df1cf212a9deae808e2e6d138981a750 SHA-256: 34ca11091e0941994d9e2c47ab878c80a6d897f64c40862acdf0f1f5a1580f50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites or disposable hosting. The primary goal seems to be directing users to external content, potentially for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://voijin.com/userfiles/files/merugavera.pdf In PDF document text
    • http://automotiveenergy.cz/userfiles/file/39313244143.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c008a91dc3---pakubunobemifazuxitim.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/firukikawuperewi.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/77727324448.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a6396dd16cc---62691259061.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-19/20210619181740247308.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526150849422020.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36891c8de---vexubejilufepezufujekul.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/56325862093.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • https://adikkedua.com/contents//files/27175953762.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162234936437.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6964b1cf93---fenosexun.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fijeteri.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/telatukokewalaxapimas.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/83238518600.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/gigagegafabisuxevux.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/76278051636.pdfIn PDF document text
    • http://lg-palette.com/upload/files/7778396466.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077d5d45af---12521588478.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/49338960249.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edebc67f5a---wememiloselizipizufazatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+column+of+hplc+is+made+up+ofPDF 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_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16536 bytes
SHA-256: 21bf3cd44e3bd194e8af0f666c79e4b4f4bf1988add52251d25b3b8f2d35e26c
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10748 bytes
SHA-256: 974376cd1f30d254dd63105ff2afb859b0c6ce0adeab2f85b339a08ca2af806a
font_02_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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