Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61715cb6b84e94f…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 09:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 97654afc700d71c4289bb00cf6b99e56 SHA-1: f68cfe0733f52347734838e5128ef1889dec317f SHA-256: f61715cb6b84e94ffa8c93b65acd4d56f9992e3e63821602f3f0f3094a66a8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to spread malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3865695d6de1e14443f5eed0e431f759/tabiriwom.pdf In PDF document text
    • https://anfauglir.com/images/file/felaxogaveditileme.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607053b10c1d3---95226967480.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2cfff36db---28960225876.pdfIn PDF document text
    • http://learningkey.org/userfiles/52400547940.pdfIn PDF document text
    • https://zold-kommando.hu/files/woloniwevaregizexi.pdfIn PDF document text
    • https://attack.lt/images/files/58731688159.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160839e59170b2---rabaviginudepuxetapunixad.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da747d1a51---76532166560.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/93484579040.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pegamedigami.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/64876516090.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5b9827300296ed9b7dfca3230cd9379e/51787232903.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1t63pv9nanq33obam41q954324/nutojamatedililubig.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078383d0ba3d---94056125688.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/469e1023bc42283e64a93ed127263347/kimaropibojebuf.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2b9721bb---tonurizixazedeku.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/95124123998.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/17638149491.pdfIn PDF document text
    • https://7gking.tw/upload/files/kuvuxi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/648890321.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/favugevomojokiduvufulaja.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/75869635345.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ezifiwesapemusexijujovi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a5320531---genobum.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d846fdf7e2---faxolisujazibepaludis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hottest+girls+in+swimsuitsPDF 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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 17772 bytes
SHA-256: e12d27b8767f33230bde82143ee1789804eb78ea869dff6c8b791ccf82a2bf74
font_02_sfnt_off0001398e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398E 10464 bytes
SHA-256: 3a6c88314ffe8f17765641db511d90a6c630290271b60ca5448cde50a888468f