Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab5f304564dc02c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f43f2439e76a83458d8e73e5ae75126 SHA-1: eab3f5a214694a394195861a957626a996dbf1ee SHA-256: 1ab5f304564dc02c12df77a8a606a946a39f4f73275240b22bfe84ce5bba0faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external malicious sites.

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 https://philabc.ru/uplcv?utm_term=check+vibration+on+android PDF link annotation
    • https://zaragozadenoche.es/upload/files/jazax.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/83451530743.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/28019785036.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/97516534587.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wiluwomujopizad.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/2915460484.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7a7b2bad15e9e9a5140710e18575c7a1/27121985617.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dutaxiwefufivos.pdfIn PDF document text
    • http://riviera.az/userfiles/file/duvop.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/81184585768.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/kemabifezopavexese.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/fagekipin.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dagudozu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/7856866385.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e436590d25---gubowozisibezabozunewu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sinox.pdfIn PDF document text
    • http://domuran.pl/files/file/fikaza.pdfIn PDF document text
    • https://teamcode.net/upload/files/ledilozegusiv.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161403c1da7b59---pominasuzobanedet.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/32315637001.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd36ca1468---potivi.pdfIn PDF document text
    • http://zuszdounky.cz/files/66882726545.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50059317203.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc6d9f21a---jofajiperebudozite.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 17152 bytes
SHA-256: 1464139afcd1a96ed14c85eaae6d29ca02af194e2ed8c7917e41c3e25204998e
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10584 bytes
SHA-256: d3c878910c7b0d294499ac0672e0b56748e08defc0d45b22c3c4ef0e074ef14f

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