Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83fcc2017f2aba7…

MALICIOUS

PDF

106.3 KB Created: 2021-06-24 19:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 21969aae28e47e0052ef69cc1019f488 SHA-1: 5d7b086531d73a84e234ffaa0bcde810eebad4c6 SHA-256: e83fcc2017f2aba74ab83387ee54df8731c11923be175c45b4fa2c7ba04f9321
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The document body contains metadata and garbled text, suggesting it is not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdf In PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64671998447.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/84347918218.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee6240c09---30287395766.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3ac13d8f161ca7160c4e664c0da9f30e/71048058212.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e519ea49---kuvolowo.pdfIn PDF document text
    • http://tms-operation.com/upload/files/pefepejigaxeru.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemulolimogenemu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9f089c83---65677190093.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24b96232de---54060410849.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a452fa399f5---42643551784.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jasunorogusotoja.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/187bd3e53703492c24c849d304b41608/11821228847.pdfIn PDF document text
    • http://vodnik48.ru/content/file/81727390126.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/1128709966.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/vakebivukopofazotog.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4ced2815---17276529393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=programming+in+c+sharp+pdfPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 5128 bytes
SHA-256: 38b09218c81eb3d679e62d701301662a1f5475eb60ece3fd4a2995c304a30fb1
font_01_sfnt_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 12276 bytes
SHA-256: 806c8fe9ca0efc35717155ab993fd91e548b7e31910b93665240308ed2c2eb59
font_02_sfnt_off00016fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCD 18708 bytes
SHA-256: 56d9cc44dd3a5f7b9e961d99db2c3dc5080ad6b761c7f0f4e3a3f1933819b5f9
font_03_sfnt_off00018db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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