Malicious PDF — malware analysis report

Static analysis result for SHA-256 f807d809a955dffe…

MALICIOUS

PDF

76.9 KB Created: 2021-06-26 14:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 177758566360d3c3cada2f3fb962c3cb SHA-1: 5f5abd57e3715ff04e19fbd7fc3004bddb8d3d95 SHA-256: f807d809a955dffe620ef9e8c10abc06bb000f3e6720b65883768ad13cd6789d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting. These links are likely intended to lure users into clicking and potentially downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3069

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=verilog+and+vhdl PDF link annotation
    • http://c2r-auto.com/uploadfiles/file/2021052505373773499.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51a7a342a---26666881732.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/31628f1246b21310f720f3b57e56ccef/21829826492.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c24cb1da1---57868955658.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9efg7mtlm13h7l7odj7v20u7ak/dawekusudesegewitakiwa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077facb03610---73576909019.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512213145586042.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/386a68c6d792a977d6e451de189e1bb2/visibiriwep.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/pefikurenakoxobidibago.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ceec31877a99d1df77aa62738dc7f59f/dekopiwi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514131646.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4384b71f82b82ca5568aecd0f6c2d3ba/pexoneferaxu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c907a51e98---2394073371.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://avela.md/userfiles/file/51063230924.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c3eab95---borofoperezazunifu.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/xaxupigejadikakepirogixiz.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/20945539443.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f7b97d1---95214180717.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe40e36d22---dopow.pdfIn PDF document text
    • http://canadanur.com/resimler/files/difikepadev.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/74502856883.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8747f4c090---46064502336.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/82c0fbb1cf6cae7408fbfe93a791b5dc/gavafexasivuvob.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3792c95df7fcce405541c5f03dc70d8/86928574561.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085147db8e30---dumufapomokujawa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17832 bytes
SHA-256: 460cd9ab25bfe25ddcb65ac096f88ee11cde1b4a9234c5d43231ceff66dbada1