Malicious PDF — malware analysis report

Static analysis result for SHA-256 873ba43e9a2b3303…

MALICIOUS

PDF

142.8 KB Created: 2021-07-20 10:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bdb72bc102215840964a3833bac6e882 SHA-1: 21565653fb00abadf98ca6c0af15b9970475c596 SHA-256: 873ba43e9a2b3303c59a519cfa84a7f15316d59bef8463eb070d798781cd0ee5
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content likely attempts to solicit sensitive recovery secrets or private keys from the user. The ML classifier and ClamAV detection further support its malicious nature, pointing towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d22ed00cfaf58090b12b40de69067689/35045056063.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13627535952.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/rewubefa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/imdsdrqnf2927pcp3mipci84he/dubof.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/thbuqdet51usb81hql28rmgtv1/23386690179.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c32561cb56d---vufanekaxalisugajonabawe.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8b77b27f---51418905268.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91ee3c95---87850387739.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872f33aa965---milekedazifupimiwite.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe6556ca6a1747f99efc07cc8a5e1bb3/rabinojebafulasoba.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779c83a277---6463160006.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/silewotazubi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a7b75436ab52ad6c5d08f59256ee01a6/fikirixozugasovijemenewe.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruxazeduzuvu.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/87124179418.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/ragim.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d595100a1c939db62e7ae5456c00b87a/vixutegakojelurikipo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8fbebffd08a71847672272772792fd37/siluxuxanubatigarewasa.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/rarupijisiwanewe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ecd490d49.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/9472729403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=photo+grid+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC16 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off0001e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E16F 10288 bytes
SHA-256: 3a689e8234a2a3060e571cf916cb6abe41303a22820a3853d6d191b5a7f31fe6
font_03_sfnt_off0001f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F849 19648 bytes
SHA-256: 45dec18e9a8210c4fe639477899b5f5b16b35dfc095181bd2b7b6c4f74fc15be

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