Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c32aab1d01f2fa…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 11:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffcb6f0a697b80a6905b943db79cdd21 SHA-1: 27bac83b16e0d4c5fadc00ba7f1305f02ec96a73 SHA-256: 99c32aab1d01f2faf22e04ee14f867cd2ad5b0914b294247310278ac64e12374
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://firewheels.pe/userfiles/file/69305175508.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ef835cfc2b1577d1bbefe958ea10124e/wovasogiveludajofes.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36073747801.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096c4499cf5---faxukevoritoxe.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcbe78c672---pevobulerozomimuxam.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9e65f01817d35b91b02b58bec22a3b55/5814615897.pdfIn PDF document text
    • http://ruresept.ru/files/file/47444751791.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/72803892875.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/59094961503.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dce7b15e---rufanulipuxewepezex.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/40475832646.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/jetezogeruwonirif.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6259e065---rokusilixuje.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210701050758.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/palelitln4f76cd6tgfro5abm8/98623837641.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/siwixupotomevagidopagaw.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30697472086.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ul2h6q5suaqle0jguhr3gouoes/mowekuvofimiwajon.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/pokejoduwopetalogupugexu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/81572884819.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f12bd076a---polatozatuwafepejis.pdfIn PDF document text
    • http://talleresjpg.es/img/file/93406024514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+testing+interview+questions+for+healthcare+domainPDF 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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 17256 bytes
SHA-256: ffafd41f1819989841529c55f5d81e01e38fb604a04d1a3068e1d3613d609de8
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 11316 bytes
SHA-256: 4349bdbd489e82fb3d62e0e921b356f090df113c25666b5591330be26837d624

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