Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee5313032086861…

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 13:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f23191259a939e553e5fe66878f5eff1 SHA-1: 8a7aeb1cd9dc3a621ceafa81b66c140cda11dab0 SHA-256: 5ee53130320868619f234794961b42d36f2c236263da3ca9134d0a388d14cc22
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/a8f427dd37d2a39988438d7b2585f5dc/75450080438.pdf In PDF document text
    • https://isleo.com/i_photos/file/wejumutodelasalevudukuzav.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e72e89c83317db89c4b8474eff52f5e2/91016584386.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/96baf635acd330837405ee7f36ca35df/rovujo.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/73375206283.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efb2f32fcb---xejakosazuwosidu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagupelora.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/42257975705.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca4171d8b---mimaro.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/hjfjskake44h2cabd82v1cncl6/zawibejowapelif.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/difiwis.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0a88e549---nukafagajenofamesifixo.pdfIn PDF document text
    • http://goldmustang.com/files/files/newirexiluzovipimivi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/mifotepulojudipanuguna.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/79e37e8514709bf0e3f968caa7866069/97536689277.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/59967440696.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d956b0a378---lakibotojesimafuwotokex.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/jedaxiralemiworine.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/76262221943.pdfIn PDF document text
    • http://jarosi.hu/files/file/puvimiwapubi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6ks383koa0ida4me128q25o884/zatuxujod.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/guvaderesesezufipib.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0365b742---jenesalipaza.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/38396894038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=should+would+could+havePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10232 bytes
SHA-256: deafe6c2a29b06e84899004a52e8bfa834f1096bfc5865e71b04fd5410f5ed78
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16520 bytes
SHA-256: 5aa8a441706920c8b162b6941b1143a3050143a6c943d62d69dda09e3d3f19e8

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