Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7e2cc8df01dcd9…

MALICIOUS

PDF

90.8 KB Created: 2021-08-16 07:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 00a3f881a5bca235e38f97a358b3c5fd SHA-1: 63fe5da5d02ec174e0d37452aabda163750f30e5 SHA-256: fe7e2cc8df01dcd91c4f2175a0276c3b3fcfab6043228a4890216adc1ff203f1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aaaexpressheating.com/userfiles/file/16530650756.pdf In PDF document text
    • http://abwmountvernon.com/uploads/files/latosefegilixu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f0c34aa---35415358891.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa88e85943---30550619213.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/megufarabixav.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/21920812344.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/7362787376.pdfIn PDF document text
    • http://trevorhannant.com/13368764348.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/uq34ovquevhao1vho6prma183r/468855750.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/21785734941.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/29942711349.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/natinikimokadunamulupiteg.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/1519358261.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/vizerubaxadoxi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/tulubuziwizegiwovol.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/30423244247.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/25391282434.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/50028788485.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jodolidokajoju.pdfIn PDF document text
    • https://parkettworld.com/upload/files/sifefugever.pdfIn PDF document text
    • http://myphamasia.net/upload/files/22761919526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+free+movie+app+ios+2020PDF link annotation
    • https://mediaget.com/userfiles/files/vizotiri.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_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17060 bytes
SHA-256: f45d907a3519403ab1234ba3921b16132de424cd2a0eaef35aec3354302c2f3f
font_01_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10732 bytes
SHA-256: 663dcced77b5638ccc927b1acb21f4bb1f064cc5c5c123993ba709a6e7e2eff0
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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