Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7237e790d7bc08c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 08:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3f8d2edae81f0516803f4595acbaa46 SHA-1: d2863b24fdb749f74ff3a5a3e2089da582eeac24 SHA-256: d7237e790d7bc08cc8b662fe61747c8fe111bd4aab0fa95fc10824bf7bcc6771
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on disposable domains or compromised CMS uploads, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://fertilizerproductionprocess.com/d/files/50272395267.pdf In PDF document text
    • https://hgb.se/filer/file/58699602167.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebojumajapakusabulogufa.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/64702075143.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134da14ad24c---88130789660.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0fef3ce4b9b187a948afc7b30a2cb87f/21544840728.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/28891290686.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/14456c5f376987a5eda6b9a51af2fcaa/38217265894.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/98294947801.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/ketipoxezojimedewasup.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/61664361001.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/89348695755.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614110c1c6555---suvagizuzurivepewez.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/simadevokoxuzorix.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/ravuwufuzopudulixiraseke.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vejezapego.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wazoru.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e38ffc08ae32d74afc3a1feb9e1d7e2e/tenazuperiwali.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109240950528443.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/61029956249.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/98436431812.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/suvefuge.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/10193257090.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/nabovukamokuxunowifewag.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9940aeac---94429916331.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/lozuvakidizefuzukasugilax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+clear+internet+cache+safariPDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 14656 bytes
SHA-256: 15155c1cb55eab0ecb571718056bdaed7c9c7b5ecf29d69b1caa73246cc01ebe
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10512 bytes
SHA-256: 2c786ae3ae16a4caa6c38f1eefd0e49d0235e167acd75cdc1e323e7156eae5e6

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