Malicious PDF — malware analysis report

Static analysis result for SHA-256 c957904525f69220…

MALICIOUS

PDF

89.2 KB Created: 2021-07-30 01:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e607f6cf7249dc3dced0f2df14cfee86 SHA-1: 00fbdb1c0dd2f92eb6b28a645192ad1782bb7533 SHA-256: c957904525f692206fe36e945b7b8ef9a823f3acee7b6f09034b9e0d38db602b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rasmesafar.net/basefile/basefiles/putedomojezakubipir.pdf In PDF document text
    • https://immobilgold.com/file/99770007004.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e14097dc---bifofuwev.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69a32a1ea7---46269876115.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/flvkmil49d3lkavn5qbha6rlt2/62371374412.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210714_233629A524CFDFD0.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/fetaratuf.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/78923955753.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1dk1j1bso6m4thhq4ee8jpses7/zununelafaxovalikemug.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zazunipezanugivepe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc6888d81---fikiforokizog.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/fewoj.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/88466663911.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/92930498790.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nuvuwiragifobuzepaxesu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/77628767354.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd9020b1b---7223484950.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c748aeba4da7b067c23666ea9e313aa/76256617603.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/48739890059.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/78255046926.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/vowazagimuvesu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc66ce7377---46829833796.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429050220137297.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/41899524911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+start+an+online+boutique+businessPDF 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_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 17184 bytes
SHA-256: e564eca8c0e9b8ef53eaa43815d2e95c1f6159f521a2f55ac6a3547ab9f7a566
font_01_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 10564 bytes
SHA-256: ef600f932c567c07f6242f15e6c0264bc2dfdedba2a651fd3213ae9411b02e98
font_02_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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