Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393c55a31db1604…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 17:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48173edd875da4b768692e981b077d08 SHA-1: f53196ff27912b06a47a370df6cd367678eca3d4 SHA-256: c393c55a31db1604ec31014a427bc9a3c6184552026f44d6bc73718a8b725b66
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to download an archive, which is then expected to be opened with a provided password, a common tactic to bypass security scanning. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://shopinhome.com/ci/userfiles/files/29113604275.pdf In PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/92401843362.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/6129522598.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/60979820851.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/bofej.pdfIn PDF document text
    • http://topstec.com/d/files/62507419245.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/49741331440.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/nigetexisamivezekidutoni.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xosizugonuvisili.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wukawijijedidunalezenax.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d37416db---ripazani.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lajad.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/92374624647.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/tukuxewovupo.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/74078704756.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/jopisinogesijibak.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4f8cc015c14c35c2324aac04ed1c5c4/vonezixisetedip.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xutumemolipapip.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/30774275017.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tekofem.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdegfc27abmti2sp9j9un9n050/sedosuxuzojololepefi.pdfIn PDF document text
    • http://gnox.vn/upload/files/tuwuwarorepagutunusavulo.pdfIn PDF document text
    • http://chengzechem.com/upload/files/wagazidatutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+lock+an+android+phone+screenPDF 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17820 bytes
SHA-256: c5341b430a8a3d753e0f9273f1078b2a3b95e63c6a68a5aad799a6ce0b945377
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 10780 bytes
SHA-256: 40126c9fb994e2703922a4b66acbb8a86a60b8d68a788c7bed370bb83d9449fd