Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13758b609ed0bdb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 05:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f28325fb0776a97ba283101763e5507 SHA-1: 2e22732b137cf47168a18f81544282308f9535df SHA-256: f13758b609ed0bdba2dc8059aab3e72d3f5527089324421624406a2402c973ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also includes a link farm pointing to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611743bbdd704---31537667607.pdf In PDF document text
    • https://mimpisiluman.com/contents//files/60207907137.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/03349302332ce14d9654be51bfa12303/vagakizitegajavik.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/degarewipotajebobod.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb92d09e1---jabix.pdfIn PDF document text
    • http://kotolantopeni.cz/file/ziwabijikimagebavupite.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/95812223823.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajumenenagamenud.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/17704188948.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mf4cf7mjmm3svbpk9ukmsilli6/litoxoguduf.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/falijosovapomum.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/49920581882.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/9749463116.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259dc00c5---99102921036.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/91113125636.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/nedejabaxewegizakejodo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/82027805350.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/68895334398.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7cdb39657---kedipawavanipusapolazirus.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/8498173250.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/mexuxax.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/11721801695.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/futegunawuguluxagavulovin.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99860b2f3---tofipopixumadula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diabetes+mellitus+type+1+pdfPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16756 bytes
SHA-256: d21f58968c2d0486bb0a05fd6e03a36539835c0372778180e76f1d0ceb4f0edb
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 10740 bytes
SHA-256: e93a843062b27fe434f92ed6c1f8704a0fbc0f74a9083a45b1a1ca65fd13534e

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