Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7020c208cbb2aa…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 02:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72a70a37b09efb0b6310eb50288d5ae5 SHA-1: ab3b33e91d9bfa0fb312a61d89f5ad5a7cc57eeb SHA-256: 9d7020c208cbb2aaa6b7d68509bf3e88abab34b838b7fd7cb81e3c025251f775
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/dbdfeade8501edb7fee3d937525c07f2/fojekazifisunedowotajiwu.pdf In PDF document text
    • http://babamoleskine.com/files/file/jujijob.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jilekalatupegeg.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/sezunakowefilosixuzub.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pnf8dpu12l7s45res8p035angi/xakudifola.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/pawujojutizuxegexufowuju.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/xukewabamiridape.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l5nqm7iui2igvua43bb0ckl6d6/nadudaluvuxetotogevigose.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/79092899251.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0fa5b0f1---97152622935.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/01b378f1178d092f691e1f2a7fc6f774/76534436069.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/linekimuja.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/zekonololikijiniv.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/97436890891.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///totalufat.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c37abeebe32---31718772880.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/11036145552.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608769bd01810---32902306603.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3fc062e7---87119049041.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f2a498bea98ff40a6fec9f70883f13c/37340299348.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cfc81d1e061d8a78686b8f1fb1d68767/luvupifekaluw.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051606242435.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609036b03b714---bawakabasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+are+you+meaning+in+tamilPDF 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 17928 bytes
SHA-256: d61095f3aa9c602158d81632bcd71ce908b5320ca4ab201413eec04a65599bd2
font_01_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 10576 bytes
SHA-256: f69af5fbfa11e7ea28899aad03ae354b1ef3ec7051a0dc8efe977abea53c6946
font_02_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1