Malicious PDF — malware analysis report

Static analysis result for SHA-256 c307b2e8627de94f…

MALICIOUS

PDF

111.8 KB Created: 2021-07-25 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cbd29a4cf3d8723861a1f9d3bdc46e9 SHA-1: 55dd72c05a848410921c845af70ab6e1a11328c3 SHA-256: c307b2e8627de94f65fa760927b763a0361b6960692349123e79a3dc3734d969
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb2993f5f2---farizi.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gqrtq3mbehitkcdr36mtnd0v17/25529566248.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/14ovkm5tj17mnpa5u4kf84jt8i/20999700492.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0b6ed8f7fb478d4dc43580a275d7eff1/13719070174.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbee8ef8b---kudowikiveponebuso.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/63422719779.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/da0ff96f6838cfe88a7d9c4ea043eb3b/42273361866.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/edfa747013f797c4fb1c24dee8096fd5/22379219645.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f2f81a6fdd89bc5d521726e28274c0a4/jidawobujaleseko.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/kewerejalavekimijujubux.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h7baie5gn1boh1l9uoika71fsk/15161662413.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7rne3mpc5abr0dabascq94j73l/38690822833.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/jodusapapetis.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/58a335b74bae43d66eb19ada2736bc45/95793786203.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/tarofitexosemanadeboruwa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff41da2e9---sukodekerotomuzukude.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/fepudoruxapiw.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/jepezirobupopuk.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/lkm6dhigan9ni7km13dm21vb8c/bodolujikirarak.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b18d8b74---fatetel.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b1b581be---mobigurilozene.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/fuputarisa.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///26675590016.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2160691a2b4ddce04f2b9a547b69724d/ninidodilodosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=scary+stories+to+tell+in+the+dark+monsters+wikiPDF 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_off000149ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000161e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E5 11000 bytes
SHA-256: 957179fa8938a10a18057e42ecd90e964756dfc606232f31ca3fba4feff58d23
font_02_sfnt_off00017b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4A 19740 bytes
SHA-256: 822de8df323ebb815584250344b7fda51a13cfab738a7b648bea4d1031a87b47