Malicious PDF — malware analysis report

Static analysis result for SHA-256 c940082f05a4eb15…

MALICIOUS

PDF

73.5 KB Created: 2021-08-13 22:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ab564278988974ae7dec95a58fee573 SHA-1: 6ade25627de11a2e61cf8e379eaf28f57b24fa3d SHA-256: c940082f05a4eb155cb6d143debd50fffb0aaf0b1c3b487cdadbb2af4b0a0ee4
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, a common technique for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f146b194c---64618648815.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b570241b---88595371788.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/dijgj5pc64f7b1c8nkeqjd049m/sumeluf.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115670ea551b---nuferututidivumulinejim.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f03400a1f3f---bubagowiwura.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rilodot.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/41366087828.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/pozaxifisofuvidodenurokik.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/lugige.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ad8d64947cb83fd30692cac0844961c7/8337520356.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3a981fca---serax.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nne8ariufv1n02nc674kejr77f/budosoxolesotijedaluv.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j0qkph7cjvvb1h23aji5plm799/baletafokibefomodemeb.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lukirog.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/vumir.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/gipaxomu.pdfIn PDF document text
    • https://chpcentre.com/files/file/tefub.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/69060334856.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607231f68c160---63114009439.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/jagebuxafujijozilekez.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/kupedalarakezu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/17945442496099f803ce97c.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a6c250fd128abd7376e311b7c79a3016/puguvezipowojinokex.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/pepege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=11.+s%C4%B1n%C4%B1f+arap%C3%A7a+ders+kitab%C4%B1+cevaplar%C4%B1+sayfa+30PDF 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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 11464 bytes
SHA-256: 20de1822aad0980bb9948a00d50902df13613d69c8c36480f98d75fa4bebd610
font_01_sfnt_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 17140 bytes
SHA-256: f7fa525c623f2cedace7c33f58fb2bf5ac062c3f8b990591a9822b43bcc55a18
font_02_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1