Malicious PDF — malware analysis report

Static analysis result for SHA-256 2678d31b615859f9…

MALICIOUS

PDF

78.4 KB Created: 2021-08-01 00:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f38494f29dba36a2d9908443dc04ea45 SHA-1: 32e5f88fb0709e9b0d1a458772b6a0588dbdf37a SHA-256: 2678d31b615859f97a3b9b41d5baf63ab11e25cb472d3d18b6813ae11bc4a10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=limit+yay%C4%B1nlar%C4%B1+edebiyat+soru+bankas%C4%B1+cevaplar%C4%B1 PDF link annotation
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/38619429428.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/pagofozivusikik.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1dbd8efcc1dfb989ab017ac47f38224b/98783219731.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/40811816687.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0deb1aa524---7671198979.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mirulagujirujaje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8jfc6cbk71ps3pv9v0tclilm3/vorufurujedivakikevejemal.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a039694930d---21878563212.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/712f2e4c06f40f2bc6320a862791034f/digisuguwewu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/32223044454.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/38171030309.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/deaea00bbcf754e7b6b759377dffd4e9/rubuwifagetejawurikifabum.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/99543745310.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdebc078cb---56267674351.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d19f443755c0ad69b24adf9be11a7fe4/tomisulufo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/36399762a52b96055e73c1d32fb128fc/jofiriro.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7f7a2da6f---13095483728.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zasadelesigavu.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/62169819050.pdfIn PDF document text
    • http://arslanemlak.come/file/41469371320.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/96942779466.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca480da3e---tidulafigipujupisaw.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f0b9856cdb80ccbf929372d109b424af/zedurudevawazufezoda.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d948ccf5b---rirakuvazisutilagapor.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///luzorotebuzas.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_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 18604 bytes
SHA-256: e672c150a6f5b01739830b3effca920c93ae080a8c53da80c581193d17c86fb9
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 11192 bytes
SHA-256: dcafc03d5c4404e82610d816f0386e91df93469a9f166b34e42039fb54297919

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