Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb7f155e5888ea1…

MALICIOUS

PDF

93.9 KB Created: 2021-07-19 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e081f49d36bcc48c2cca5d34c194061 SHA-1: 2ff9aed7646f6256a3f926d18e7fa02e3f7d2a26 SHA-256: 3eb7f155e5888ea1dfe477fc6969647669c86037d0b7d629b1dcb305b2582609
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://rosewoodcity.org/nbloom/fckuploads/file/8134926891.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25ef81e7b---68044896474.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/virateso.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4f8c14f530139ff45265ffbc9881cba9/38045194063.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8bee8ab059b854c81e8324f4f719b150/lowisasozake.pdfIn PDF document text
    • http://3q1p.com/upload/file/210707065029820251rbo61slhkki3.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1405a8c448---poxevazotepopafu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0f280e51---26341895301.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076169abb68a---27903371060.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baaebacbe0e---polarubigabavologof.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/81a1d77ebb9153a7321b980710891e30/59523441453.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/8839704064.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52f8ed227---24880122355.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/36101582562.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i86roqveto9dio73g0t7qnl67r/kabexolumuzivimeniwewufu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/f50k704jqqcrrrvg3he5hnesj7/xapelafozev.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/vukumupowanativarov.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/62822062283.pdfIn PDF document text
    • http://zae.me/datafiles/file/75172266033.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/742f08c177b9136f8290f0e253927cf0/93611713040.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fulitizimidojaropo.pdfIn PDF document text
    • http://qca.ch/userfiles/file/lepomelizeseviledebilore.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5o40h0tpravv0g70lrpklqhfs7/13565776978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oh+most+holy+god+by+paul+enenchePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 11148 bytes
SHA-256: 3f199f7785b1ba4641271f460b23471709c810c1b1344cf922917d0ad86a14b4
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 20348 bytes
SHA-256: b42480cd4d6a3a13fe99ebfc91e9ebcd7b919d6698211f2c81b690efc2cd608a
font_03_sfnt_off0001520e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520E 16696 bytes
SHA-256: b179be39b93fd8eec9185c5b721c49c48837e98c3e0f14d5cd43009073a7e513

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