Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cca890037a8f67d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 22:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08d7d4fe158872818b42c81625eea347 SHA-1: 899e413569d6d90d069a450847c55cac428c38be SHA-256: 6cca890037a8f67d8f36a606ba5ab63fb5942f9a55656fc7d7dc25677a869261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the compromised hosting, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=convert+multiple+jpg+files+to+one+pdf+file+online+free PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e6rlauoes1p61r2vjer6hdr190/ganeritoka.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/26bd82e2f09b54dff74a7b624eeabdfb/12309398096.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/2407501134.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/67547760359.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82922309613.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/37757065423.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/latujel.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/zexinewizemituxefi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609db8136d27a---xilebunomoderasaxaja.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/38593829290.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49a45a9d5958c21b2b457305675b11e7/70638181718.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/56673207406.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kodaparamibejize.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/51804160007.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b939e1b36---69230597130.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/6153641861.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/42961352293.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mumafu.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/38065812989.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ce18bf400b920f5db5b54cbdd4295e8e/veguwesatewibezazigulop.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903003646a0---75738484759.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/rarizixavolam.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17008 bytes
SHA-256: 5e769ad593390eac69a4432b749b8fd151fc3ab17ad905111ba4cffe358a33bc
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 11004 bytes
SHA-256: 3b081a1bfb6dcafe3970fb7d54fd8e07e745c94a10ac3fa2b68566ada6714835

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