Malicious PDF — malware analysis report

Static analysis result for SHA-256 598a2da609d2730b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e2a6a256b2fc45839623a93d4b1c33b SHA-1: 553f392970eb5b0226b868e5d122b2e23a0080ec SHA-256: 598a2da609d2730bb5afc4b42c6d26f98768aeff3926a86678d9e4a613f7c4bb
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple compromised CMS upload links suggests a pattern of hosting malicious files on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1b4977a62f4f9df1b2b04bd51bdb06e2/88189286840.pdf In PDF document text
    • https://wsbtitan.com/images/file/3897576933.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/r8f8krbgui742276hue6tdpeq6/kogotodow.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb696b3033---25919489883.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4dbedbd8eb95b036aff92e85c5b91c62/xudazaxabewoliw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20d3a5106---61401463442.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9c8d70df---jibilijufutisegamuxebox.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/21541203699.pdfIn PDF document text
    • http://medi-sen.com/files/files/69793681857.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/38819349567.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/nebaxexowenabuwolo.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kosivorajotinutad.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5c028f660647d4ebe3aec59bcc4f8cf4/xozegu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tlrt2rpqoftb4uuhtf5bl70dt6/76092513244.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dcd97f00f---sowodufagefikexomamiz.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/55304505206.pdfIn PDF document text
    • http://tion.hu/upload/file/40609816381.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/68403840881.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/caefd734c203e8b8a19470d051bd23f0/xireranawanuj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/bividuxalasivemew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=revista+taller+de+electronica+2+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://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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 18148 bytes
SHA-256: 3bcad0c1514398d70674e14a221dce649b16d858d4364fdef5f052284b2aa6d7
font_01_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 10844 bytes
SHA-256: f8829bc841ac533b5a6b1433fecdae36030123f42d3a4c4beeb9046a53e1c576

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