Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf72faa0ce2ef01…

MALICIOUS

PDF

99.1 KB Created: 2021-06-25 20:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4d24b1b0662fa77ec1f56622a7d024ad SHA-1: 4191c174d3c2443f7ac01d45d1d38b5a68044a36 SHA-256: 2bf72faa0ce2ef01e21c41e82ce770507d0be69970c3a45591d13983e24ad3aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=501+german+verbs+fully+conjugated+in+all+the+tenses+henry+strutz PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6bab17bd---91705889643.pdfPDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/102c5c3ce635af6d5aef86a535ce9aa0/mogiwedupivozebigopukut.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/900468bd2cdcec05861cf7f20a696445/vawutep.pdfIn PDF document text
    • https://ebooksweb.net/files/file/68859072988.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/65698586709.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lefezilolebidutimudodutu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/fupusikegijodawowapus.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tdq49lk1ogk6o8jqmajh5k3jm7/29164137910.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/65810355291.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wexofu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/razorifuzune.pdfIn PDF document text
    • http://adveotec.com/img/file/tatutuwafiwonasobujuvugaw.pdfIn PDF document text
    • http://vswet.ru/f/zutolapupazi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gaputeloserasene.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4abb77fe---70304458561.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/005a853981d3226bf869aec01943f08f/70184977457.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/73472850100.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210616094148.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/nobilepufifokiv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208ee5a12b---webevopatalutatosimimil.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xemubotewe.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/zifivuminelaroz.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210618_023601.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mqjihfcsqht3sc21p4ng9imdup/30820824530.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a791ed5ca---58634022435.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160804dc047082---89996605638.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kalazop.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_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11744 bytes
SHA-256: c9f1e8eea820890ae0090c99efa1de60299a6d90d755172edf6e5b39c99a90f9
font_01_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 18840 bytes
SHA-256: 52e5c2d966adfbf8793b8452ecd63776dd2c825d33f79b24df8eb86f22a66f7b
font_02_sfnt_off00016616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1