Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7820a7ff5fe808b…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 03:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 19ec0321a38d034100f65b1bdb7d6479 SHA-1: f0718ccecfc09cb6fec94d63b28eba18478c7847 SHA-256: d7820a7ff5fe808bdcb14e0dcf577a1d09d669aeaf71b67eb6fb5f580d23758a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hqc2qnnotprr36dvmo52q7pvu2/guropogufas.pdf In PDF document text
    • https://prosperitas.be/data/assets/file/devejuga.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/31v9n8n29660ecibpgkj603v51/46119510824.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6090d927---lidajamuvajufo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e5d2888799f24a28c05a4038093943d5/menojanomorosuwekezukukix.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t1tvr0pu5alfv0nblsok0d34ll/zubirukujudulezomewes.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/lemamagupenib.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f2385ead---guwupinibiv.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tv6nfunpc0bb38u2cfgh8ci1fo/80774429893.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/13262199373.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/vanigogeligexofegekapepi.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77693148300.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d91a7db9---nuzifokimonufigiwa.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/98284260693.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd80f5069b---66035318038.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085827109685---bugujeziwa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eb63eb0969eefffd56ca4fd8e4af142e/keburavugovidozuvoke.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1lc7v7sta5itgiudv5i8qdck83/jopexitibaruropajiva.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/60891050738.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f034576dff---vepirudukozufuwesosev.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/xamijujabakakenilekomej.pdfIn PDF document text
    • http://didula.com/img/file/72994222331.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/58719294497.pdfIn PDF document text
    • https://cape-electronics.com/media/file/46867445054.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/53e972rap9hrmombdcumlrbc28/79600786103.pdfIn PDF document text
    • http://iviltra.lt/images/files/kemepekatuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ps+touch+apk+new+versionPDF 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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 19136 bytes
SHA-256: 94c4f18fdb32a2a69bfcfe3c231752d12be4c8a5965746a54f4a993bd6d51e2c
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 10772 bytes
SHA-256: a555779d4cb749b53cbd727c94c6dcd0409eeb58273f36ce1d3542b3721dbbf6
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1