Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8e181c3442c286…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 19:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8963efa928be650737710f04c0734012 SHA-1: 86840b5439c3e50f4db7ebebdd9f4e829a72019a SHA-256: 1c8e181c3442c2864cf01f5d12a89f761a7224e02cbe0416a707450939b931f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing trojan. The embedded URLs, such as the one pointing to a compromised WordPress upload, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/109b50a844e0f7d5773a3666d924a202/13645832409.pdf In PDF document text
    • http://mgtuae.com/uploads/file/65846965176.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/83318467499.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/vesizenijajo.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/94357687306.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/labobomasemesepo.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/fodowerejolibig.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/78690001058.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/xokixosawij.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/88277973035.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf203e3ead---6087786317.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nebotawimevepevo.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/jujifebone.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/35300841150.pdfIn PDF document text
    • https://badrivishal.com/media/pakokefosenene.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/lunijirakosasexavikek.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/biwebativogezuvapubawuzi.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/sojoto.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910030742.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6ef3fff491d48487cc41931d8d9b883e/tuzisezuxelululekosido.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/dakaz.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/31314001430.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/xemekonuzidig.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/logeru.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/89713004434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=candy+crush+jelly+saga+mod+apkPDF 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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 11240 bytes
SHA-256: 2d9fa0757d4644b8c66e099cad6be802d60fb6f0a9b3c00af5e6b39291664c81
font_01_sfnt_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 15608 bytes
SHA-256: f8fb0ace2950740b5f80d624e10c8690c38e0a47406a081f1f71f347ae6bd8a0