Malicious PDF — malware analysis report

Static analysis result for SHA-256 162ffbfe751ff851…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 21:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7aa33e0862ccd145fc36c371e33d6983 SHA-1: a786b7bbf323837fa2422a82e4cd4d25d0bb02e0 SHA-256: 162ffbfe751ff8516108ca74eb38077a25f8198ac2aa27c32642cca8f43ca56d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf17410c8---71594510030.pdf In PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/liruwosizobixolobepo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/59bc62f83b4933afb86f5dd8c33b4f8f/gubiwo.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/komese.pdfIn PDF document text
    • https://penal-garazh.ru/files/mesifufaweveboxalodakinu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nirupibibozulajixa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nekowosijuges.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8ucrl8il0tt41ojoo8lfmvj8me/burasunimoredetena.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1ee5fccd5468fde87f992b1d63533/95291253283.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86323981285.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ab3fdc49fce79547b0ab14913a08e18/26907861403.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608223b58b55d---fejopiwuwudibitemosaxu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/77503315673.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/gugibarozerulalil.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3777a49fae532243ef9d141d1b1db362/48546384876.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/9898630106.pdfIn PDF document text
    • http://lscapital.it/images/file/58415320981.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/homd9q5o02unlkisachhfesp07/nojewuripon.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/7986052783.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ae334f46dcc32709c04ea35297dc00cf/53693480882.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/82852815926.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6acef892---62041231277.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ba4d407d8---dudefutiza.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/78338488793.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1044856932.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/rimile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=average+attention+span+by+age+pdfPDF 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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 10928 bytes
SHA-256: ac1954a42052143c525acd9a3b734eaea53454289f40b08526d5093a5b2d1712
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 17404 bytes
SHA-256: 9a1157f44798d4ee1d5b2d1e2b63b91d77693f7bbf74f32f3aa30fbbc0df8a99
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1