Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ec763cd75243b3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 17:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08fcfe50c329ac272e2290948e33e224 SHA-1: a8b68d388b5ca84879395b6c3107129d2b44f02a SHA-256: 01ec763cd75243b320c1edb8fe90d9b38983c22560e72388fa738ffed5f2d1a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://apvn.info/userfiles/file/56248004786.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210813_973CFC73AEA47A3C.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/vesolelegebu.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/59390298151.pdfIn PDF document text
    • https://attack.lt/images/files/gelalikos.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1319ce8d6eeeab3852b702b66f94a96d/45223272114.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/70c2q71d84olbhi5dp8qn00bq2/93559722675.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3312e84403273387144e308663f55904/83985684658.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814176bee5---mevitejogevibagosamupip.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007d5aa596---96789987995.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/63597562930.pdfIn PDF document text
    • http://jkohut.pl/file/11413623788.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/448124be7613f92eca535736b238b651/23557389186.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/70693954890.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/31654203583.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ltjpf8pue6feo436s73jaav2h0/durofojebo.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/15552615255.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9813ae2ecf---lobuwumosusiwijetuwed.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b83794ff7790e219677eaabb3b2f0535/68687215148.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2r7m71erab0k2ofkbrgpuqajqa/dusenerukadi.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/buborogaxabopubijebubija.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8e5124da---12645133362.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d58bde17---wowopereresugejefurewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+homes+worksheetPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10472 bytes
SHA-256: d64858ef783c6e0beaa83cf38bdd4212dc091b1244f049f367a6dfa07854356c
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 17284 bytes
SHA-256: 0d9c44c3a2ede6043f0a54323690ec208568670ccc3ea597f4ae941153217dee
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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