Malicious PDF — malware analysis report

Static analysis result for SHA-256 8397a03a16aac21b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-19 17:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6904bb07143ec1d7acc7d6afb24f7c5 SHA-1: 16c32568c8040209899b9aaa595d60f71ddfcbb2 SHA-256: 8397a03a16aac21b22f6e6e3275bad4e373c9076e3a3555dd3866a58633bc0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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 http://vankouwenenmastop.nl/UserFiles/file/wefusimirolijodowafebot.pdf In PDF document text
    • https://prestinireedcorp.com/userfiles/files/75243725582.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c824131c5ba160b899d5feb782e7394a/31941938635.pdfIn PDF document text
    • http://hydrem.ru/images/file/werakedexima.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f4bf23831a6d3c4645a48b29d117d51b/sowametixanedidevaben.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/3909754189.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b775b5d4da---xogeji.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1d01b8908---telawifajixemefedosok.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/75531030354.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/27548740158.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/89130504797.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86404709b0---3602111447.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/15426849337.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e09262f---28637275654.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bezefimufesix.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/pulerenasorulig.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210814/2108140259458314574jcoeo2g3mfy.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/75458883402.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161085f44d9e46---55826551315.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984bbf237fd---65116961869.pdfIn PDF document text
    • https://dm288.com/slicice/file/xebowubozenonazezifi.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/22294987761.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d6592bcd5fe89900b084527ce4d273fc/27996817181.pdfIn PDF document text
    • https://hgb.se/filer/file/97238344341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+write+daily+routine+in+past+tensePDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 17284 bytes
SHA-256: a8be6ea80137e720cbdf7177635a75ef0c9ee4d0126764db8b91354ac607e40e
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10676 bytes
SHA-256: 9b96aba418deb10bdd0b30ac1b00be2d8b7dbd9cf489e42d93696300409e6e6d