Malicious PDF — malware analysis report

Static analysis result for SHA-256 44873c402661cdb0…

MALICIOUS

PDF

113.9 KB Created: 2021-08-16 03:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac5f463928e29ae82c92ccc89d3b074b SHA-1: 5b66231807082a1794efaefc97a1a55baf6158f9 SHA-256: 44873c402661cdb053225e4c8721176190968bfb45f6ba46022d3685b1ec8f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://archism.ru/uplcv?utm_term=meditations+2+descartes+summary PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af3894b3b1---volametemazepupese.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a86298715c30cc5fb5aca3faf778d814/86395702201.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/49539944922.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/rasoxetujanudowagag.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/10905527020.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/94535836211.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/6544932405.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/xifiwanaxufibetup.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/19987935768.pdfIn PDF document text
    • http://e-sportis.com/images/upload/71256299209.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bafomuvumijuwotapebiz.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/61729883815.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5dcc56306---60426179866.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ab7b3838---jokijun.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t5roimidot7cfsb7qughv0u72p/23039957273.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0291e2ff63---84731640314.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/vabebogodeligi.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bf829c7e---ferifofanuvosafip.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/826fe2c73937cdabeebad2f0e2b05955/47211566722.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b621199921---xunax.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jipixiwijotarovukidorejap.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c42bd4b72---79698051330.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0d4e6098e3bfdb6bc4bde8ddd16eb228/36638799821.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_off000159f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17206 18408 bytes
SHA-256: 772609f5e7fdb04a1903c23fb54876bf304381cc9f56d6c6fd335354c23ba768
font_02_sfnt_off0001a10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10B 10812 bytes
SHA-256: 1bb93185ce7c0f05178c9e73973d80576742db00e6fb0e707243488b0efcc026

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