Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd870701e17d4da7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 04:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac9fb34afc536e857d79fe8d80c02e74 SHA-1: c4e18b01f9cfc18c0900dbaa746f95d747ae6321 SHA-256: fd870701e17d4da79dd1b8d45e66c8d9c6d2d74b762f2a47c34bb06645ffa5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=kogan+10l+digital+multifunction+air+fryer+manual PDF link annotation
    • https://invest.pl/userfiles/file/83591004442.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/pozanalezewekiwitewe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8801a88e9dfcdefe8933bcac64b4b6e1/xilubes.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/6346655546.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zozitanofawe.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/falisudutaxusiba.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10b60d721---72598432859.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/76072279320.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/50308244965.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161112328c14a4---49753166467.pdfIn PDF document text
    • https://amgaa.org/temp//files/442206510.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b7818f94e2e---winozewobopufirogasevego.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160edf96d235b9---94512605808.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/jarisegusogewirixo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610930e8e6154---35898265043.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160983cdb8c359---1624115980.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/37daf23480e0a447cab2bebde1904f26/96009835367.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/35808019471.pdfIn PDF document text
    • https://izr.fr/files/51204693824.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/depilamif.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0f45f0782ec370cebb40898cf0147aa0/83509426336.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fd6c8a5d0891189d57b765e64c4ac6f4/kofugemunufuzepuweji.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/6786124004.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0ec124b62eb439b57819cec0b5e8d75b/ketenowifaromazigofigafe.pdfIn PDF document text
    • https://harom.ro/files/file/jafotepopavesubedeza.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 18616 bytes
SHA-256: 17c79f79ccb6f074eae8de5d235cbcdef0ed31d988b5a8187d8cd4fe1d471fee
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 11032 bytes
SHA-256: 48bf41e0c26c57d5019cf4ba63a77e5b4bcf89d152cc89e66dba91dee55570ec