Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e02ce982f667c4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 17:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4c6de3034cb852be0a56c8cc48da04a SHA-1: 0154e90d51a9f2726244dfd9f9618b0be32c0fe2 SHA-256: 41e02ce982f667c44dff080b38188ca440febf1aa6f133349941ec37c77390f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs are hosted on compromised CMS platforms or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=not+in+vain+definition PDF link annotation
    • https://sunnyrosesschool.com/userfiles/file/toxupezunofawa.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/38992849736.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/mixopazetanajodiwagekeve.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060304520573499.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zulubaxesaki.pdfIn PDF document text
    • https://12tiga.com/contents//files/35529991800.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/pejezazowerivelumowimale.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lesigafavedekunuzekuresu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/45150774718.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/30813787794.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tepiv.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/munagum.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26490019a---4552824594.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960033e3fc---61907139503.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e894f57bf0b4a87ecf5fcb74c26353f8/72232948244.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/45c9913bc425b634877195bbda353c42/80262282478.pdfIn PDF document text
    • http://nessium.net/userfiles/file/17999078137.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/sotanukudugi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9dd430152---bekepij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610868d81420f---29099942897.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4bcd676c---titevunagupisi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd06fe638c---wigere.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210621/0819524294.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h5lirureqb6smg6e570qad4u85/36190210530.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_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 18024 bytes
SHA-256: 0b45762282bdbb833ce0a555d55e4d5716f3777984df04fe385705d9d8cb47b8
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 10076 bytes
SHA-256: 2d6f2570b0a3d35a86a327285fe6f150a3b15b1469f35d033d38a9f4d5a17e8f

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