Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f099387d9da41a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 00:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9a32376c3f55b6b59936071e78343ed SHA-1: 35d1a644fe0e1a913bde80427828ec31dc4af072 SHA-256: 80f099387d9da41a007814234e19db371d9ab9b7d1f871411dc047bdb1349ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external PDF files hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coevent.ru/upload/files/94695932871.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/22b4dce086b0e9efc5f6a12bd7a48227/nebebavamejikosawa.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a66052690---noguwiguv.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26cb29918---25025250854.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/xujefokutejekuvakev.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/54559698480.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25feb9114a---kiruruxatin.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2867507885776fa39861b7444fc973e4/94765702403.pdfIn PDF document text
    • http://royalgroup.at/tmp/56441855079.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd90f2979f---92257547203.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/25614087270.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf3306610aeb7257b2732fa4f4c2ebed/75096722874.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/50798363988.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0465667c---83019067677.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af3a1a156---limopoxovokejig.pdfIn PDF document text
    • http://holzbau-napetschnig.at/jesuzajapotagujodosopov.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/55277564165.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/35803512972.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/97040760783.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/clnmrhpo6a6hp5v1ilc6nepfcn/lafebezejifipuna.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/7822883611.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zeleledebinofigeraxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+insertar+un+objeto+pdf+en+excelPDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 17392 bytes
SHA-256: f3dae63453c238011f990894ce69823ad692ade3d455497e99ba170b379c1a73
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 11284 bytes
SHA-256: 211dfb6ce0a545a2bc6fb662580c375bc1f7ba68af025bc62a0f2b18f99a75bd
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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