Malicious PDF — malware analysis report

Static analysis result for SHA-256 12763813e98d7ac6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45bcb0b10cf722c82196d6387a5ed38c SHA-1: 1bc777b3dd1469b50b0ecafacffdd2878c234493 SHA-256: 12763813e98d7ac6344918104cbbf34b9f785fb2de203838fe08e3d44a213c96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The embedded JavaScript likely serves to further obfuscate the malicious redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sikanderajam.com/Robinson/ckfinder/userfiles/files/vetumu.pdf In PDF document text
    • https://tonthephunglan.vn/upload/files/pujomapopegoxox.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/68927359221.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c59c4aedb8829c7f9ba1894e3f7628eb/feruronomulegi.pdfIn PDF document text
    • http://fruitsad.pl/images/file/85479611191.pdfIn PDF document text
    • http://askort.pl/Upload/file/34858745669.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/sozetakokugeripovaw.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342239a9cfb---poletixupegukedo.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/vasokerenukasujaganexuz.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/laligejuzefeg.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/romunumadopatubukosejaz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ca68e070---manupovopulubosajofixos.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/redifegidiw.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28737259518.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/31810254681.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/88017511022.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/januzuzizixopeminuz.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/83772455036.pdfIn PDF document text
    • http://imoroz.by/upload/file/xulutex.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/17512848884.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/26289744591.pdfIn PDF document text
    • https://satesayap.com/contents/files/manupakegimopozotol.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/72293672484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=yes+and+no+in+different+languagesPDF 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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 18660 bytes
SHA-256: f13c4afc381a522dc8f671fc490f7b894891b834a67db88c82ddc3c555d64840
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10612 bytes
SHA-256: 397942b574050caef93a07b9e5d523d18038ea8c5f6ed28dc025588d113c3e87
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16340 bytes
SHA-256: 52dd5067e004a5093f19d447f9e7e67fb382ccd5a9785c067e4d8a9ce714e481

Open this report in the interactive analyzer, or submit your own file for analysis.