Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecb9e2c72b76d22…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 00:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0233122feeca048e2bb7512aea7a8b0a SHA-1: a8ca3aeba271d3aa73c6b1eea3cfec9599d6d820 SHA-256: 7ecb9e2c72b76d22f981074ed02980659ac8002e022aa9d7bd46c124ed3e45f6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple links pointing to potentially compromised or disposable hosting, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, strongly suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chickenwild.com/upload/contents/images/images/7710532500.pdf In PDF document text
    • http://tanabuauto.com/js/upload/files/vopekifabedo.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/sifugoj.pdfIn PDF document text
    • http://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/dovofuvawovukanetoxewiba.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/xaxeduzuxerinalave.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/womofegilabemigi.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/53738643969.pdfIn PDF document text
    • http://mamam.by/upload/File/file/75748436208.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161443432805ee---buzopiw.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fuxaloludowituxixukixaraw.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210907035152.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dorojafagiledag.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161446caee2c63---mimota.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75742970700.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/88487484259.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/wupilizegefis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134098c4a494---sisowidini.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vosuja.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/pujitodagametasidopuza.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133560027618---pavarelaku.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/60220005663.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410f47bfc50---rofemabisu.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/59041732156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=webcam+effects+for+androidPDF 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 17072 bytes
SHA-256: a73310df19c1bc746e51727a0a8f62bec78d5ef30c8bbe994f06904d3841f41e
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10724 bytes
SHA-256: e5319dda9444ebc8947d9e97ed40a84f0789dc35be386867333ff7b63fee200a

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