Malicious PDF — malware analysis report

Static analysis result for SHA-256 d800c6bdb114b80b…

MALICIOUS

PDF

95.6 KB Created: 2021-06-30 14:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d607a2bd57c0a550ba8821be1582db7b SHA-1: 88d915251625aec345332cb0bf2f90b9b00e372e SHA-256: d800c6bdb114b80bd7ca59dcbc5ae8bc62e63f52991001537a9322ae0191fbbe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9dc611d0---lagorevisewegiminosagosup.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/76385344137.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/76852316088.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98755bf740---zofejafojugowe.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/91164690962.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f29bb38d3de8cc18c2140b4712c150ff/68953608274.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba89b07d4---35369152344.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/sefoviserimobut.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/40371538068.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160891a845c21d---85826414784.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5c9020e1bcd7bd3b284d74606b533447/89774574491.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607500abcfd4b---bodujafateri.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/87d2cf52500acad53a0fdc317042c33d/44833045576.pdfIn PDF document text
    • https://susta.vn/userfiles/file/64448928149.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vorepokarafax.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3b341fc7---lubosasezuxebodobebirobo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/18fbdm4a350l8ud4fknhpuohd0/79194177591.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/487f00bea3a8e73205ebba9d7bfaf905/wamotunoluvaf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6692ebbf9e9faf87301e96497a759189/wemoveziz.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/75766955900.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160761d34906f4---detome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=agrement+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e9a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9A2 22812 bytes
SHA-256: 2c0784a6b029fef2a770d1f032560cc74abfd60ba8727947953723c670ec459d
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 19128 bytes
SHA-256: c0abb59d2637a5e6e9c365c8d993f879d2588c3ad2b08d126621c7b643a04edd
font_03_sfnt_off00015a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6D 10252 bytes
SHA-256: 85d6c659a5a6aacce9bfef16f91c5457ed0a0d7d02ef696dbc938883fcdc09cc

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