Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7e6e05bf4a0922…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d45094a9e3b6e40fca75e1756a4fd15a SHA-1: 9735934829eb692efeb05e1a6f80bdd70a5bb9b5 SHA-256: bf7e6e05bf4a092269f351d40e30220d2fce1c1d399fb3810ac62c72df5cf61b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ivankrivanek.com/userfiles/file/bonemazatefume.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/23336324842.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/tufitojavimexurejile.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/45434603883.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/30783682842.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/81819812740.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/deriwuvifim.pdfIn PDF document text
    • https://matricula.arendic.cl/files/38158254651.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/luzisanafotaxuga.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131087acc90e---62578411363.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xugadekonajep.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d36975f317---99821305726.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/7415044130.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/70919123089.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/jimubeneri.pdfIn PDF document text
    • http://risme.vn/files/tulog.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/27727170645.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f1151917b0daef426f7a211ea6ef2106/81376858648.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/70941919790.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/528418870614c3bf8ce83d.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/vizigixuverutajiruzam.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/21618618549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ijju+movie+app+new+namePDF 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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 18748 bytes
SHA-256: 70828103f6467809a2aae9db79d56a10796997bcd7e0df3f66ac3bca17cf9f2c
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10336 bytes
SHA-256: 44aafcbd0b52bfa320a7efc778770097fa14f70669cf1b996cfa21107dc01346
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1