Malicious PDF — malware analysis report

Static analysis result for SHA-256 58667e4cefe5769c…

MALICIOUS

PDF

78.3 KB Created: 2021-07-21 10:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5218cac98edae4a63dc1fe4225abc57 SHA-1: ddcfa983ad8d63b862ead0fb5da83764d1deda2c SHA-256: 58667e4cefe5769c2e0c918abaa9bf3bfa4a71f9ec49d7dc2a22948d75156a0f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to harmful content or facilitate further compromise. No specific malware family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r1u4qj40qph14p50a2iibhh2vg/robusezazaloxanokope.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea8dcaed8---33861415017.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/35246724048.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dederubepulosalof.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/78347464366.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e86199e---6459022365.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c325460---46757921125.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/gisejuvegaw.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/89785017046.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2765e7ff3---bolabibugejes.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58f39678---38051345826.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608150b26df3c---nugilusekusiliwebutudide.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/20807349200.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/jazobal.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0823396fd7---pebovenitapepenisoxoruji.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8e9ef343---vawulebuzutano.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/93356653497.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4b0fa61de5b009ab3e0ae2fae3d962/8749774452.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4o4pcul1k5hetrorjte80pjpvg/fozofuwifaderemewuvevo.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/47462629021.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/buzigowitu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5ffc7345522c6b47b2a7e4af62041ccc/86531893813.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/35bfaf250fe7c06f46689348422e54d4/14786698052.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bcc960f8---79200075759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=intolerance+meaning+in+gujaratiPDF 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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10588 bytes
SHA-256: 35511d5d341ed62c76879397e80bfbe8bbc2b18dfc664eba44fad1ea945de2bf
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 15536 bytes
SHA-256: 784dab79da5313b053ac937d983b4a3c0bc614d98cc475abd8057fb1d523e849

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