Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e5fa17888cd495…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 06:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e17804d1c38b91a54f399fc31c0e9dc SHA-1: da6df95a9b3e8701a87af09314c8f00ffeaee813 SHA-256: b6e5fa17888cd4958388b76c0ba29927020d89e3048416d9743669347075eb9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://garglob.ru/uplcv?utm_term=language+setting+in+my+phone PDF link annotation
    • http://www.chubsorn.com/file/files/ratito.pdfIn PDF document text
    • https://fong-cai.com/upload/files/lopoguranapep.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/16236944206.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109172151204269.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/8896474304.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/72835847771.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/20931651252.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130842d3937a---33490941690.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dewipurutepam.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/dajelipogekop.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/gakoxepebusunute.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/josufilavabomuva.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/vakozojijukimude.pdfIn PDF document text
    • https://mimpishio.com/contents/files/94556210484.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9a30025f5b1885448fa95557605e6180/pojupowulaxuzoger.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/popitalovunubawesowedomip.pdfIn PDF document text
    • http://precisao.org/files/files/miriwep.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/90jscksqcutoh7k35pocfnjdbo/20186429976.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/filofitikalukubokobuziz.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/jisobafi.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lidoladowam.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_off0000b9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 18616 bytes
SHA-256: 7d6b315e78f74f43d30430aef648ff19e52311eba691c56e5cf48db5a0050a75
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 10724 bytes
SHA-256: d55a36648992626805339683d519f64b099d8a7862c6006019d76a4e2705c9ad
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1