Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c549edf80498e7…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd9a8c1b6313cdadf671c657e8091c7b SHA-1: 7471b00a841450f1fd00909a65151e35746e9562 SHA-256: 21c549edf80498e7b3ac4e43405e1e7a52e14925d335d34745461defa14cb838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the document's structure strongly suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://watthaistuttgart.de/userfiles/file/desuwixagilemojurufuwi.pdf In PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/92824244639.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/apva6kgt9uofe8toogv4f7sda7/95664948040.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/6093431954.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1e62141f5357af2fa4e86b5d49755d7d/69034778710.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963f5b27a2d---94687321137.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0bca53ba49899431ae9eb936c7076387/tozepemonefagisufudozor.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/15ea7f43b3d4a73d727cfe6ede061d28/dafuzavi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceccdd6afa---73338189317.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eab720642f765f54aece1a4b860d5c4c/vafuru.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xodozusudud.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/59540738448.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/firopexofesejopiletivoze.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44475596087.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/949431080609409ffe03b8.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7c0a95ddafdc966ef09ab7952cc4422f/fawotojexorokumizoj.pdfIn PDF document text
    • https://led7.ru/file/tafitilanofudadidizidi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453b34e421---79812916321.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3258e9a38c---pidurudotukavomiridom.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/xafavobomejekegib.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sft4h8p3qc49a888k6ioesmj2a/xidufogelusejafodinirono.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/estukeuehk33k1jlhn9q4d91do/lezomuweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+help+a+chick+with+a+broken+legPDF 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_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 16856 bytes
SHA-256: 71a4e52648615b268c87038a97bfb0aab5546e19d0afb7d5e53313a7e2d6dd5d
font_01_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 10796 bytes
SHA-256: f77e1c10f59f4ab64a8b01ca0244b9e44efc3a9799ed7dc738fb82d6f0d68860

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