Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed9cabcff90d0d8…

MALICIOUS

PDF

107.7 KB Created: 2021-07-07 11:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a64866ec5cabf06847f40350b40be91 SHA-1: 05305b21124eb9490ae3f244949c854d907a8611 SHA-256: 5ed9cabcff90d0d8676f2254815eab923dbadfa63f519905365bede18817ec61
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://shuimotongyuan.com/userfiles/file/54353842030.pdf In PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210630_043240.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f665fc0419---80869522032.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215bbb2c0b---fejojama.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fae98d7594a169730da74e79d8985d87/66605746407.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tamagevevelazafexur.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/subavudesosuzi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d74fa2d0f---68828967429.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6e8872b85366e30cd977c4b529c7d06/jewekomaza.pdfIn PDF document text
    • https://mmszke.hu/files/file/naxevavovevanaxudigapel.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6974e03362998c98b532ecbff9a80e31/purametegetusakem.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/xufogumejuvolixabaf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4f4796dc---seterilew.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/igbolj2gm8kf79jem5okdnh855/wituroxajeviso.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/fobed.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2373d40fb---68018944917.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8e0e1312cc4457fac76e2d8d2abbdbb0/75134883476.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c932453da---todunamarixolijobas.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622236559.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760efe6d506---fonowatujamogogifilis.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ak4q6bq79757tej3ol24j839l8/tekora.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/20/file/20210620_045128_180.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/38b2788f44274d4057e666066d41e1b1/8531347409.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97d22a08c---63370815649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=king+edward+iv+the+white+queenPDF 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_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 10584 bytes
SHA-256: a8bbb083c6faae0bc0f6d120855e8a76a819194ba78ad7e99c3e5620b8ff1c82
font_02_sfnt_off0001723b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723B 18412 bytes
SHA-256: eb102395868ffba3e6dd943fead1c5402d733c69b0e7eab33a3602eda0b5febb

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