Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d8b7a9e4a710a0…

MALICIOUS

PDF

159.9 KB Created: 2021-08-05 00:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 018d548de1325490624b2701d5d38adb SHA-1: f8cfc0948f7fa59749b2ac1675f44cc2760360d4 SHA-256: a2d8b7a9e4a710a0f4fb3e5ed7ab2923dd96d510a106c4e53bf7c9cc87be84fc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The primary attack pattern involves luring users through a document that appears to offer content but instead leads them to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://phutungquanghieu.com/app/webroot/files/ckfinder/files/17671865105.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3885d59260b906003102fb062040114b/rugulixuxu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc4727ed---37751057031.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279819a04---juwefogesabiledizewok.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fpjmvu02qmvdculsha8hosjo63/95486056270.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/91796104922.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/sasezo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0t16g8tjmauqdshniev08ojs69/dedojejur.pdfIn PDF document text
    • https://digireg.cn/upload/32949933113.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ee2cdc1eda86a4118d9e2dab26f88f16/80708683436.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc613b33ddc---sotutozuxasepi.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/58896771902.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2781b85f---68087330873.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nimakeguwinasapemenidipen.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f5bcbf6ec27b9d480b6b479e2872ab8f/22789079892.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/bakamufawidejigemuxe.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b8ebf87e7f42dc53bd112b4544c28501/18096030710.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77083ce73f---37402892775.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/46230564422.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kopirukadazizobijav.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2726a27f39ed553443e7e98fa12fdf21/fitulobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=examenes+santillana+6+primaria+saber+hacerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E545 3240 bytes
SHA-256: 07d2c1519c7e650d56c9f81f79e360ccd3dd13c0b5968a02d043f362225c1ae5
font_01_sfnt_off0001f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F20F 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off000207ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00021fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FBD 20472 bytes
SHA-256: 57a3bd78d8fb8de9f4b3bb8a8f0f7bf5a2c18923057f9f08fd7f16ea5e93e54f
font_04_sfnt_off00025500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25500 10912 bytes
SHA-256: 22ef57efda88af14e5cb9881003a5169fca1e79477b0ab4472d9276052b88aa6

Open this report in the interactive analyzer, or submit your own file for analysis.