Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2589160b33be048…

MALICIOUS

PDF

81.0 KB Created: 2021-06-30 13:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a14f585bbe0743db2f349ba18ce4cfcb SHA-1: 2c52439b9d80dbb34b5a8089700fffbce4eecf5a SHA-256: d2589160b33be0482cd795833b73e392b9cb1593394921fe467a1e0bed848729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress upload directories. These elements suggest the document is designed to exploit vulnerabilities or lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://philabc.ru/uplcv?utm_term=storm+king+state+park
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd3d56125---rafunetuwus.pdf
    • https://tramhuonghanoi.vn/upload/files/91802294303.pdf
    • http://sicilalluminio.it/userfiles/files/53593505362.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b500f9675f---sewuja.pdf
    • http://zartmobilia.com/userfiles/file/20210517135345.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/21576154646.pdf
    • https://airflow-skateboards.com/upload/file/puxijodosowadanikeliboba.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/53117323983.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ab3564ccaf2854cc82f23c9353e81db5/36991692028.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/n38l6um3bj8al86c7ui75eo1mt/fugesafate.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d6435834c9f24a5461ced9c84334ccf7/bijitufulasudutasujes.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24f4c4f05f60925a8b104f244be7d1e8/sivok.pdf
    • http://garage-fuji.jp/js/upload/files/fojol.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a4d7bac7---67464244186.pdf
    • http://allaboutdowney.com/userimages/86638502764.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe551bcb45---fewuwibibuduzodogu.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/92546031594.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4o84lg9t5tnilmbt20gtne60r7/13404158573.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5225838364253061706f67987462dcb7/wavijejorududu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9131ce78f---mupefibamumilafilone.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88137508ff---wezedu.pdf
    • https://alarrabnews.com/images/content/content/file/49224537953.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/97469460031.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/tasazezakevapavipudo.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a467348c53a---77679870914.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6f.bin
1c8a546c753b9a336f4ebe63134c9bb40e807e6e2926061fe71cad4f9f3a8bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16632 bytes
font_01_sfnt_off00010643.bin
88334cb36c850c0333d6eee8aa14baeb613a3ea0a78cb75a9393d3f106cc901d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 10716 bytes
font_02_sfnt_off00011eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes