Malicious PDF — malware analysis report

Static analysis result for SHA-256 da22f1d5b2e0e9d1…

MALICIOUS

PDF

76.8 KB Created: 2021-09-27 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a26483c2cd622ca6e13239a493aff7f6 SHA-1: 71e25159f3d3b6a67e71874f7edc5672cc91bd09 SHA-256: da22f1d5b2e0e9d1bde4acd3d295732b1332ca862b56106ac1c1619774594ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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=how+to+send+files+bluetooth+android PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/24055306811.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rt7gjbvopcka1sd46qh4no22gm/95053287147.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/puradujijefu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/janukitazu.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/texiwelodunijofobegovugan.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/milel.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/xekojusavekupumimulorar.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/37223008136.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b992c7228---runejisovelasobaviguto.pdfIn PDF document text
    • https://bawauang.com/contents/files/74152272139.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/waruj.pdfIn PDF document text
    • http://cabini.it/userfiles/files/pibimizi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe669ec254---povaj.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/50410429164.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fd0f0c866---jesewerav.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/jigalu.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/pedix.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/ruvumivazoxi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/40069802409.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///2521084280.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/ziwemugam.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/fopumos.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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 18420 bytes
SHA-256: a5a7701c252435597558cd70a62414fc32fbe696c7f32ce8766e473501668dc6
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10768 bytes
SHA-256: ac6ffa1a7366a3ba4f61d872c8d75c11a5a88f732287549d7bc8d6042a425fb2
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1