Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b64d52c0d9144d6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-25 12:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c45322d3cc5a319fd9a5cb755fbf9a7 SHA-1: 90345f27dfd04834a0f8144ef1545da22e658bd5 SHA-256: 1b64d52c0d9144d65b1d6111153fb90595b6d50dfd617bd69d01463faaf9c873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://santeh.md/img/files/kejedenezinuvojazeg.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/803a9ca082f387ed645f1349076582bd/28775988047.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/mipodewademepom.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71fd7741---35844075473.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/15378519588.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde9fb57fc7---basutoxeparizafuxiluxib.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6fba32dc9c0a8a254cc6d6f501dc2b4e/8398318622.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19356178983.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/daguxozokakipeludega.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/62328524058.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/11632739970.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37954831844.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c278aef1c---xasof.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc6d2ea3f---13513381247.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/legogufa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb567c3efa---riwujoro.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094435caebef---5474878263.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea7362cbca---fedofusidowojevem.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/711724521.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a722cf7e974cee3db0fe532089e163e2/xamevebeme.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c80ecf2b8---sepowinaxekusiwagix.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/refu3l3d1mta4fscbellreu45j/66894371196.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/49h2c0qcfu37p02vi1tke6pum2/85047473723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=butterfly+waltz+piano+sheet+music+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3281648c061c5a9b516c8bf4d68fdc37/2046654536.pdfIn PDF document text
    • 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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 17352 bytes
SHA-256: 7524102e6c351e799e4f5f1b2506abbd1322818d76d1229315625f0877cbdddb
font_02_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 11300 bytes
SHA-256: 335324d7e8100fcd53f9fe664cd3678de3b80a10c0eceff4ebeb9682d2d4a59a