Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b5184cdb564112…

MALICIOUS

PDF

76.5 KB Created: 2021-07-13 18:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87e8e391c925563c2acf750a60935d83 SHA-1: 6f8a989ef18e4f175ff3fbc98a6f0ce588f77d68 SHA-256: 91b5184cdb564112cfe889d91fd96d72c58123e9febe364c3f1e8abd1f8fec67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging exploits or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de5bcdde0---xudotekasajaru.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f5e72c2c---fupakavekidilujifigoj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/modozivozenafezixi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0r2r02fef8losc39mhbilkgksr/majiwokavagu.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/janarakaxiv.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/vesiwolisesubifi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/98767322676.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/batadeviw.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2jsno52gtbqtfiptujtju0vrd3/80511854226.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caed7d0f78---50957808793.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/2198067638.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3390275f1199116dac8fe24c532aaded/68483618756.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i9d0s4dhjpcic5jdrs0dfqkosj/nonapakewiduwimeta.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16081fd7c1a496---nitazodojatuvugum.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/8134001930.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f2c19e273---64784193059.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l43gpo3t58of8mn9a5glra9771/jefowevebebidafegen.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/zedaduxezubixikilenogima.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/75113012015.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/8841582707.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/javafijokanuketo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/89c31dea1ebce731d0528331c30833f5/katalu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9705c3cd21---98262430459.pdfIn PDF document text
    • https://tdfstore.it/file/bedarogadetozirosa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/24945610216.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7d0c72f7d0c278f9145c578d77189f47/bakawavifuzafifuparu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lucky+dube+different+colours+lyricsPDF 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_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 10712 bytes
SHA-256: 6adcc4907ef64c7e8969e70ab5ef6ad782f5bdcfed76c893a1827c16b4178946
font_01_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 16508 bytes
SHA-256: 44ec701b836e877d638c7656db13f7748cd074d30877bbf282a220a1e920841f
font_02_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1