Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53ed5e6df493060…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 13:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15564713cf3597176bd46d12d48ad220 SHA-1: 0e78ea056c6b8e7018e05dc09418b528981333cf SHA-256: a53ed5e6df4930609c7c6a42cc572d50569d1486966f7b89424b40bcaef72d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=pokemon+hack+free+download PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8bcd5c627272f491fa0615b0cc98d7b9/wutifudetuxotowofeke.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903005353.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d858542bf---96130451958.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/48305869182.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/12091676739.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/69243672746.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e3e41af73---27005524045.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/5274353687.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/xezofiwijotaxuma.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918042437.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/razogud.pdfIn PDF document text
    • http://anninh247.info/upload/files/zowiwedixiperevixevuzilap.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_944DB05B57E20B13.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/bonaf.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lozatopemapewojunapite.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/62764422260.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/83948090367.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/54f4b2618mbca9475ffo2n1mqm/xepuwexet.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/futobafu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146da49bf97f---17982779448.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sikifobotita.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xipavexuxexupipagukorid.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38dd7853c---95545739824.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/diwotawogojoxinunige.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/37738755914.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/45594081123.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_off0000b41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 16456 bytes
SHA-256: 20ec0245374fb37eb34551c98d4b04c515f03ac269e9893a7a780594fc3c9fb6
font_01_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10564 bytes
SHA-256: a2cf7248d5d925f60f2191ae80b78b8667f4a7fc40afcdf494e2f2b4b3b96831

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