Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e5afc7169a06a3…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 04:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7402982a8bacee03fa9137cd0db4bebc SHA-1: 892ebce207a859ffacb5dfa7b1e3f6ef9f9bf50f SHA-256: b5e5afc7169a06a35341a3a987d7578de7c7590d1797f7ce9f978179a155ccf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9cc7f239cdeb6af2c1fc1f07a6032f52/luzolij.pdf In PDF document text
    • http://webursitet.org/Files/file/tifutemodefewewidop.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed2a7c2cb---79635010419.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/63231958713.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/bamitusixokuxinuwilesafa.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a4329761f9eb478ea224c456ce72d281/46747712567.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cff4328b748---forewuji.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258caaf62c---92060408143.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94cc0950c7---fepevebezikuvi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210602180558.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/97274334620.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/57019621273.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a86f768cd08---xisagawefowirenizeg.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/57247149880.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qjhoe6u4ikthhc34qc6h5qv0cd/25902566585.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf236655224---kowimadapatirewuwisigebem.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/mufakoxu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2e499825---79344024604.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kuvod.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/79020484786.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3776f516ebf727b2cb9dea677cb183f4/91008507928.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9rkps5us2r8a2dschee9lqmbt2/sowunowukogavakajunililus.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/46070007396.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/73729767010.pdfIn PDF document text
    • http://bakoca.hu/files/file/68268820694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=witcher+3+monster+cardsPDF 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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10756 bytes
SHA-256: 01c4788993971d7802c619b30b2ba2ed94133147dd8301dfc5ae60337ed5fc65
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16992 bytes
SHA-256: 8b196021bef7e943fa2c1c6afe16ffc9fedeb6f5a28a72017ec1ea039bc7add7