Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b974a9ce13496…

MALICIOUS

PDF

84.2 KB Created: 2021-08-24 05:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0f7a9d9da13b157132ffd06b2731210 SHA-1: e3201018c8c7393ce5e7795faf51da0e4c4e714a SHA-256: a40b974a9ce13496cf401bde4c9454a4de89d90c455c4432400083302ee91db8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an intent to execute code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e8833b30---51163960727.pdf In PDF document text
    • http://barbusci.it/maisUserFile/file/80303508311.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f5d5bb02545d35fe1db83b8011308267/zaluzupipapiseri.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/53371308535.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d859a64a---xejorapozi.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/31094698909.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/sosdjbqhldp0577k0cnva4ad89/setiramosurufeso.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/11039f7a55ddfb197e9898260e259d71/pomezefokem.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/30249740679.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/57623129604.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6f47f9e303006cdad9a95ad6a950b1a4/44527105802.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/kuvuvonenubi.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210709060458.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i2bveps3q1dl7qpresc9cestf5/mekidurumagurikat.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/15679787313.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be05af1e41---turusasipeduxisola.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087812403aea---suduvuke.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ddd13f023e21825f4eae9a13cfc33371/86609626819.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/59355783169.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/df145d9085d2d97326846cc0ce782fca/mezilesesogaxomik.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/11350890601.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ea8c9f0---42061660141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dssp+secondary+structurePDF 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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 10584 bytes
SHA-256: 2baf34975f82223f3fbfec0aa0a973ed6ff32c707fad2e8aba4949ec7803aa0b
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 18684 bytes
SHA-256: 694e0a9f6d659f5947f64261938b1e7eb147b65983b4de29d2c19615a8fc6b14

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