Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5beaaecad2de2b…

MALICIOUS

PDF

84.2 KB Created: 2021-10-12 03:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 210a8465ce9f5063c376e7c5da857923 SHA-1: b7400aa5d5e00998d72143cef1b4e66eb356593f SHA-256: ad5beaaecad2de2beee0c1d560d0fc84c4060fb6b115d5e8861d536d3086a831
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ontis.sk/editor_uploads/system/files/84290765751.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/bugakuxoxomuxiku.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e754265538---totadubesotepej.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/73399443879.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xopoxigapifonezemiboxu.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/3841319153.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/42535810071.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/412d711aa1ba0862d9479820194a5244/29910492974.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/limuniwazezamov.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da123b8d8---67009062929.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/99656754504.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/bawijepipowato.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vm1h1q6di91tqitsre5ls4tb41/fokatafefawoxagekotejez.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/88965498578.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sumukibune.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/18312046745.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/jawerejowatususomozipebu.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/83466041448.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bigubuzojilubedarar.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/razezanom.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/pexaso.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/69334198138.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=what+happens+if+you+shift+into+reverse+while+driving+a+manualPDF 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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 18060 bytes
SHA-256: a07fe52b603b0c795c37b076ce0c297027af0b5dd14d8606c786f26ed54b2b1d
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 11304 bytes
SHA-256: 4e18c029b91e33d0c0f3e85100fa91c0c2750f6c5a844a4f8d9f84d03cf6ba36
font_02_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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