Malicious PDF — malware analysis report

Static analysis result for SHA-256 803da48e4f6bc3db…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 05:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f3873328ec1c5de68036672fcd54f1b SHA-1: a337bae80ce00da694f1f4df27b950b6d90b957a SHA-256: 803da48e4f6bc3dbe6bc2e7dd099059f3b41a3962043a4c19f084df2858a7539
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dc7671507---36730270012.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/h4hl5kjlcigeqjge8gdl79hj0h/27056623590.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/rinoxifemu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160795159239b8---76067699529.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/levibukol.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p2et6vhdvu3uuvu3kalagl6o0d/60195768863.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dbe98306b---25342337196.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e460f2ad4309bd9a4db7abf533d16e04/fepofolitabibo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/belarodariwiwis.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/nutatezar.pdfIn PDF document text
    • http://www.bash.cl/media/file/tolowadimomu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/61362757871.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/urbi97tbict0bssf3vosjsif26/rafamerezikisekexav.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d876f0lmbtdm9of984hjda5bm1/ribedi.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/45023433706.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d8d601f5c55180590844666e02719668/80121344112.pdfIn PDF document text
    • http://soles2walk.cz/data/file/63370323690.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e8401653318a2977dfa2e956b9d1bb94/semorenulagabomoxe.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/97949619367.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802061ad526---sululenutozidowokononed.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/ruzaxijeterolejobaki.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa447eac6cd---48140917592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+take+off+a+glass+screen+protector+that+is+crackedPDF 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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 11068 bytes
SHA-256: 4814add969bd7cfe320d26c9e9390a8937896b0edb5573b9b46f2d55b2cea4de
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 19256 bytes
SHA-256: 769f8be6b011be99fc49d1aefe6feae0edf61dadf7bb81badfeb81c2022fc892

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