Malicious PDF — malware analysis report

Static analysis result for SHA-256 d852d32f8ead9668…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efddf767103d9fc3d6aef5b461ea2ea1 SHA-1: a48bdb3b6c66e3e7e1ef02872634eec8a15bd768 SHA-256: d852d32f8ead9668da854f8c97a90660c16d2639b41e8f08e70a962b236837f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, pointing to multiple URLs hosted on what appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f371b3e972---funetejufegefek.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210624055359.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/72623917440.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kofasuxokojaxonama.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/85769500786.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/37353478426.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/57210328001.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d045d26bd0---8003163873.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c2t2o10juestqafdi2h0ggrqlv/jilenexozenudele.pdfIn PDF document text
    • http://riversedgefm.com/files/file/zagikexijilebenowoda.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddfe29780b---fonumibi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/jenekapamofeta.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7devr6imktmdn7cc7f551jtj9c/kefifepajajejemulovumovag.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2djd8q1vjj8ltj73avs3ptlnl2/62006253690.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/21989151897.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc558a6920---nofitidezag.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e6e02cd4---70492974900.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/43860738769.pdfIn PDF document text
    • http://weingut-suppan.at/files/zefevivanasenefuteza.pdfIn PDF document text
    • https://wita.lt/images/files/47558742105.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/55685511090.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/18173ac100a497d1c53c83c0946d6264/42394697816.pdfIn PDF document text
    • http://yuli-china.ru/d/files/99180049958.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wokuvamufezaxeg.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8bd0c2056d85489a3a918674ea24683/93772337941.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/loxulikuxele.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e3d745c26926d43fe65896f318b6fdcf/75975734702.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cdgb1vc9q5ipet0glj12p3mkfp/telabobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=goal.com+arsenal+football+newsPDF 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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10736 bytes
SHA-256: 858e009ac12370cca67f139cf674ff692ac1cdf2a5b47460d3cf487fd62ed1c0
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16164 bytes
SHA-256: 37c4d247afc235558a1cc69ff89c637e9034ae465eed169cc96ae9146c036c89
font_02_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1