Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff60ac6159fac46…

MALICIOUS

PDF

92.4 KB Created: 2021-08-04 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb1d3f97b47de9b505786670a64c178b SHA-1: f9b013f5ef2772eb1d161e9e41009611dbff5958 SHA-256: 4ff60ac6159fac46e744c2ecea7f1b0d656ba4cf3431efbae65762ab1a42c4d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

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 http://chaukitchen.com/uploads/files/29756539706.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/58366066417.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/97824267091.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/34139848305.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5a24a4754b936fd8439d5b8709de35ce/kidox.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/941988aaeac512b8efe99c85e1e8f392/72329211797.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db74e18667c4dc2ab868d95d54f49301/bijusasado.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508bf3a32a---nawudenapedug.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/79673595724.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/29565037483.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/69oa6gn42hu3elsgv2t69imjes/95935335665.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/023f4cd3c22eb77c2174490f8bb24c98/74876095813.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf5418f9db---gotaxoxirodapukelojegun.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bigomuxelulolixejoxiti.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde1feaf27---zariwenabesawabedefona.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2dbfkn7fdmv2j7nrmkqsuforu7/22350528032.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/marabevanevatowelad.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/959f896176cf8ccce1cd439a0806babb/sapavalegimesij.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/modabasifovixiz.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a531cb614---4885228450.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/21024369078.pdfIn PDF document text
    • http://cycling-software.com/files/file/nimonijumukurudi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2930bfc0f---xivesatutirudinolige.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dblhs3ja2jdf4iqc4jpjrie2oi/sudifadezakubuvozukajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+little+pony+colouring+pages+princess+lunaPDF 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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16792 bytes
SHA-256: eb322746d3ac072accb1c1a7b45cb2045771cccdb816429b7739c844d361bbfc
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10756 bytes
SHA-256: e925c04cfd454a274dcb76ffd8088f9299da6ca42823b83e34a42c1b5cc33bea
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 16376 bytes
SHA-256: a01a737c7a820813cfa51b01279294299b1ffc5548447524e952fc772e8c75a9

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