Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e7d889217fb50…

MALICIOUS

PDF

116.8 KB Created: 2021-08-11 21:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 648f354fb6e996381ee63bc18d11d3b9 SHA-1: f3317acd41d289cd7202db6d797d9c8c5b19dc83 SHA-256: f28e7d889217fb504fe1bfd910fd797d21f060a060901ef0249ce7e5853ad8cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lmrlim6d1lnicb3dh3hvbfm2n1/16334449948.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a662dd10c---36172732810.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/mozava.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/89901918739.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1ef53a42f---vajisivanijorudibi.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xafuwejamanulidifu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/tugozab.pdfIn PDF document text
    • http://olympusflights.com/files/files/zerikonateloroxojokamesuz.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/fororewun.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a86503ef4ede8990ec65af1433e0f77e/78869082568.pdfIn PDF document text
    • https://xigmatek.com/upload/files/mumalurugupamunuki.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/30209286373.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/papurekugovik.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f64ef28d7f2d7bf225bef1839c9f7ffa/tubipuxesi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9072vlks2ajc4c07qsfjpevbha/xipedolaritawuwikeb.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/21d5unnt989r62d765jtu7dme4/88860322337.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/91464803340.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dpicdcahiho1gsu91f9j45kgqg/wepomutureseta.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6076c1960febab75881419bc334b2438/87173827533.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0e8a69d1---37679615786.pdfIn PDF document text
    • https://foulardfotografando.it/file/14219277036.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081015250755.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/sevodivevosijodudizir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=multiplication+table+chart+1-1000PDF 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_off00016b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B41 10744 bytes
SHA-256: e264ee9881fbc2f2829220d149731dd04c1c192f50f7f5ccd8890ddbc78e1fd7
font_01_sfnt_off000183b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B7 15864 bytes
SHA-256: 4a0c86eb438cac803f0df25b39d79e80a76c440a4ab6f32f3111bf4a30cf6537
font_02_sfnt_off0001aca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1