Malicious PDF — malware analysis report

Static analysis result for SHA-256 a009697bf5f1c7f8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 23:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f72de0300cc4d7a52c7f8fbb424f8b5 SHA-1: 92c9156587fa0c69d9fa4b912b286075ea8cc248 SHA-256: a009697bf5f1c7f826504d9571fd092cea0e31e7d8fe26622ca26b0de20f6bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://laborke.ru/uplcv?utm_term=a+night+to+remember+high+school+musical+3 PDF link annotation
    • http://gpsputhuppally.com/userfiles/file/nilunawonebivalob.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75913e5d9fac9ae1d242de5042fe0246/55468115586.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/99673447512.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/58551796335.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/32359a1b4e00d1421eaecabb387ddc18/vutuw.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/puxukulepevasopiditexi.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/55981734701.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/gejuleja.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7306959e2---tutote.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pamadakebezarepitiwivu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/24911330024.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b4b2961a---gilosa.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210707130702.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kekipifalomobibu.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/divilugakisowurimefova.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/pugimatujenikemimatomixu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/vakatidavuwogazukasebaku.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/95996005496.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qshu6q7e761d5cb5nt2n8sc8uv/varubarejogoboronigasale.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce22d89f41---nuraviwoditibizisemixudo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/03/85067285648.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/14817420996.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/34856065991.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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 18460 bytes
SHA-256: bc533315aaf9dd8f41c7c5dc72bc30f3729d8752ef9506b9b2b5a4cdee748f8c
font_01_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 11068 bytes
SHA-256: b4eb0e868ac3ff925c5046de1052b1314a31f8ad2cc5d0da59b903ae26af873b
font_02_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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