Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5695439d17352b…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 07:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4065316666abc327ca6dd9ba80bb9d6 SHA-1: 6cc5740f1a55d66bec3104aaf11fbca45d849e40 SHA-256: cd5695439d17352b7d546574ec7e30c37ce85ed879623ccd59d233ab0bdf3dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://serramentisiciliano.it/userfiles/files/81330518199.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561bba267c---zozalesubujux.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zosib.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/2835561569.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/witetomogatifif.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/lemedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c19b6779---86126958595.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a2ee22c0816bfa43a3689bd356b6d479/66817719241.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/28c253135b74fecab9af4fcee6871f7d/tivuxeno.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c547cd5e587c181b3a057ffa9361951c/warakojuk.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/73975057645.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/dopipirifuxagege.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/xososozugigud.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/menida.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b595c3f9d6fb1a6f24e5f5fbd0496d8c/17251321206.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/56481511161.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/rupawisodexosofefo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa08cd4d91---98801133481.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd2b55c47---dobafasivufutazofubim.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f762050c---39804760546.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd0686410---moronuxonem.pdfIn PDF document text
    • http://blatt-gruen.ch/files/bajevesumasowunixi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ad6d97ph68ek2v5sdd146ubsa2/dojawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=book+related+wordsPDF 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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 18024 bytes
SHA-256: 2a9f4e6adbad5e0c37065dc48d9ee216849a3e6d9a69ee9a884c78f81592c6f1
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 10276 bytes
SHA-256: f9a7df16c0d475838f33da3f26586191520b4cc32fcf1f95c9e1a8faf75bd26f

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