Malicious PDF — malware analysis report

Static analysis result for SHA-256 4239b2767be1423d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 10:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8b549a9db2771c2b3c7bb202057b5ac SHA-1: 70e8af401b66ec3ca4c19b813d8894c49f74e84e SHA-256: 4239b2767be1423d5ebd82ac083e99cd5920c1752b6a6b082ddd0816e92e3e5d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=cdr+to+psd+converter+software+free+download PDF link annotation
    • http://dichvu12h.net/userfiles/file/36642333990.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/17804947982.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/1477453608.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609142bd848b0---88155880248.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828dcaee977---90399840561.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/83823142b64703e415d1f986c88a1d95/jefoniko.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/72535189110.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/081138c991e5a91ba270241fc09a7784/xinazajigajorudabopevu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f2590adc---61571468014.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098429628940---zusigawunaxovel.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zugasojiresobaredez.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/87726824847.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/h6suifumj3neg45fav8a8sbnl4/gibazanodato.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ae1d18c1---36305120844.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad835ae9e4e---gugemejibikiratitolu.pdfIn PDF document text
    • https://phunhai.net/upload/files/72033891701.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c2a6cc4e7c83f85cc21cbd4bf78c04c/65908040399.pdfIn PDF document text
    • http://bronia.org/userfiles/file/kanalepewome.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/13629467777.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18285130790.pdfIn PDF document text
    • http://altinay-law.com/images/file/67347629337.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16260987374392.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/tizinafetebop.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ef71476083dd48389bb9e5229e91de15/dapojiv.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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18068 bytes
SHA-256: 0540fcc88efa4cdff366f807a43ac8f9d26ef6693937ce2a6ff0e88f2012951b
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10704 bytes
SHA-256: f5e79ffa82f82f9a9e781c73c88bdaf0dac0abf442c7c722866e8659f3dbf880

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