Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97c7b77b98fce95…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 05:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20edf0ea5f5ae38b60e2041dcac51324 SHA-1: 8d77641d3a888037f2c3a4824fd8edfe530876d5 SHA-256: a97c7b77b98fce951f2fdcc59bbc332cd3409108f49638329012af3a25822b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to direct users to various PDF documents hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and numerous external links suggest an attempt to lead the user to a malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://churchtextile.com/userfiles/file/29261586752.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/70736d94fec42ec0437075253b99946b/75264536873.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e11bb42119ccc0d2564f901931938caf/88316418002.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ebdb33f8---zibopirokatevedepujazez.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/avjlng36ctf6srglv2begnnnro/tobis.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/40c12c935363b39860a2507ccc57abaa/xezazojezi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/36956728844.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210826045743.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/lagivakosizadagudob.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210719_765CC27E6E17EAD9.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/e8a22319ae431e72ed92e6cb82be971e/41969370479.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/kifobutexativ.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/44667050346.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/66190856197.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/folenoguximasafiwawex.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2d1436f06e75847452034759a4a4590/34135323657.pdfIn PDF document text
    • http://szhlfz.net/upload/55335753484.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ziketokininuzawotoxoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffeae19ba---vexidikuduxexilinuwin.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ki8lbm19ncsfa6ip6j4j2fupge/foruk.pdfIn PDF document text
    • http://baove247.org/upload/files/kezokixoxoz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pinifekitovizatavabobel.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/85930400585.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9e8577f8---jepaxavozemafoviveruku.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/52791339871.pdfIn PDF document text
    • https://aromamarketing.md/img/files/44134002919.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39682058731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=biological+science+freeman+pdf+free+downloadPDF 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_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 11004 bytes
SHA-256: 22b6c3c4f8d9ae1a7e2ad7c9ed4974100dc561b39b350200fb13e371f362c92c
font_02_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 17052 bytes
SHA-256: ef78ceefaa258c6c9cafb1157f6b747f301ad80a4a9bf4aa6ead1a2a1a313d25