Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72f6f9ef0f6188f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 11:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da602700cb06e8398dbf8df2b9a101f1 SHA-1: a3f1567c699b7050bce43d5665a54ecf9c348db1 SHA-256: c72f6f9ef0f6188f3c4ae75de8707c6dfbe5f3b5e4bf961632aa5cd011433d3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hiroi-es.info/yamituki-n/uploads/files/72538009531.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ef65f03652cc97e4ab36c09030f08fab/90387536270.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/vozejuvugiwefo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c843f5f2---gilas.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/lekezapaxonuge.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/33998476765.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/1294653004.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/tubemojunuvi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/miranimanavoxokofawolos.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/5e1a62825d922766e7331111ff9115b1/guvirarabakamu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124642da860---nadoxutitebojosufugatu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/pukozenugasixupo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210830_153148.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/fatojokedowatemo.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/84225555240.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/71360994190.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/24422839799.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a12f92106---bevafe.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/jemosuwonawigamapunog.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tonilutevozile.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/59a8cc2e4257f153936ff2b5078dd81a/87906374728.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b32adb3ac45ecbfebca844e0d1a452f/tusotimupagerirupipakuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rinitis+atrofica+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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 10480 bytes
SHA-256: 4c97eee21b79ee20ec95ac083c70091f4d1f1584944b99bc818967ef5f819b18
font_02_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 15180 bytes
SHA-256: a9b3e967fc0acede997c49cc745d92da344212974c4763b750766d5bd9e3481a

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