Malicious PDF — malware analysis report

Static analysis result for SHA-256 5117f5f82920f0fb…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 16:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fc0dcd7be81869a7790cc87550279d7 SHA-1: 1762a5353ad2df6850ec21fb7565cfc0e6ebb8c5 SHA-256: 5117f5f82920f0fb38cfa248d1a946b8338157344d47565589c994457b9c96e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and other domains, likely to host phishing content or download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/14fac0cb9f74d2cd391df968f79260bb/4946403380.pdf In PDF document text
    • http://dragonera.cn/admin/userfiles/file/40454125196.pdfIn PDF document text
    • http://dgjst.com/upfile/file/68766188349.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/masonofovesoxoluk.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/24511151944.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/62995502362.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4af21f78221df8de9c7480a14d297282/18341686458.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e541b4688c---98520283844.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/27242843203.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5d3553a380c2b2f9e96cd2bb8f26d0f8/pobomexilujuxudopibokewo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16118190032beb---13864060266.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ca74ab87a8f---75145570600.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/56392153830.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e7df1188742aefebf14353ed72563847/zoxukaxezapigogosuw.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/fuvajupisivinebij.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/tajevevuwunikujifopatuji.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tp7bcc2rqlgjiorphccdbq7364/butewatezafex.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/gigalorapigalepeduwedaf.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/5512775073.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a729e9ae2e5---27725269119.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fuzep.pdfIn PDF document text
    • https://luminex.pl/upload/file/noxugagiwujopusatarivav.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/01bbff59e3437ab07b57dee2ef61b442/zijenitaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pengertian+skala+pengukuran+menurut+para+ahli+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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 11016 bytes
SHA-256: d90ed9e656c9a69db32b4e1d0067c920aea20b1da9ebba575b132b122a9dca7c
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 15808 bytes
SHA-256: 2d5c97ba6040ccdac6a7dc6262123eb7caa2b684dd146c3eb6267afb9ae07fd9