Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbfb6924f715f53…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 06:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b215185ca3d9c96005fc211f1ece8eba SHA-1: fe69484b5d9705bd10e2108b0f46f6de4d61775b SHA-256: 2fbfb6924f715f53a8c8ec08fb95dc77a0bcb51049b88b00e4b55424c4eb3df2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://synerhu.ru/uplcv?utm_term=warning+camera+failed+s10' suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://synerhu.ru/uplcv?utm_term=warning+camera+failed+s10 PDF link annotation
    • http://thaiboxes.com/piceditor/file/darotudoxevemotumitejem.pdfIn PDF document text
    • https://agrando.cz/files/file/jupamotexanola.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nobiwisafo.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/4651787650.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/relitexikotepamojebom.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/wulaxekoposos.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613638ad8ac9b---wulofuvolimusewosef.pdfIn PDF document text
    • https://citytrafik.nu/images/file/88591990813.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/21377913671.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/48156081214.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/23122325671.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/jonibolole.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329ff34a1ac---94821626875.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/juxak.pdfIn PDF document text
    • http://kgmda.com/upload/files/davujujisev.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wamosejuxoverewutarux.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1e174d1a5fe6dd571198075220b0887e/besivewoxazi.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24472523609.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/fibirivajigujebezuferofa.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/zigukefebezadejumenuw.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dexolil.pdfIn PDF document text
    • 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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16976 bytes
SHA-256: e95282348f12814471f962eac048a848eb32fec84e94dcd9f56cb529f1d058f7
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 10768 bytes
SHA-256: f9d1a3fe21bb5542b31f1c6c702363beb15dd05c7c5e0ef69b4a83f71b66112a
font_02_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1