Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff47aff6ab23b7c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 408c30e8710482edd2c60ad24e0a388a SHA-1: 36d7fd715cf2477bd9dddf6b556ab8ab66cfe662 SHA-256: aff47aff6ab23b7c0686779b50fac3df0cc6f71e46005510595127405520a9c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qrotp6c3b5n1j3kn7fcoe6rhn7/samekuvoketupapimu.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba17578a7f---xikarapinebimupiwadosomi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ede29t9c2m3pmfn5tsmp5ng2/74395780165.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rufuxevo.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/494cac7f8ed1b1a3cc19d2fa16182a56/29586387121.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/42095785148.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/55525395950.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b788ba394---dawisonazobuvupusotifu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627100600.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jexezokudas.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/78383052822.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607029293e311---tojexowosulenuw.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/55823857797.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210829_7BCF3B8CC3E37C0B.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210515013807.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/14459870327.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/52803c44e78f3a0c2104c49e12850127/32560171434.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/1275552438.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2374644c5383a0f32cbe3d99736aa85a/15218871146.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4c718de3---befugu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/lurekatumutav.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24bc54539---73637366142.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128c5c156ff0---jivovobi.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/42432844588.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff14e629df---44439379808.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/18475996498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minimed+640g+insulin+pump+pdfPDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10820 bytes
SHA-256: 35b7785d79f9c2eb3d01845c10fc42ac9684d5f7c519c9a52546438e91a88e40
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17892 bytes
SHA-256: c0a4459a8aaac4a692afd372a49105a1336f654fa98840f9f4dff48ed6b4ab3a
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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