Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd29ab8927f1df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60b618a66025d684947560521e30878e SHA-1: 797e0fa0109ebb560adfc327aa79498371ca1d2d SHA-256: 82fd29ab8927f1df6132b7fc82789bee43c7dd29dfd553ff71b5efbb10e68b28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=godly+by+omah+lay PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8605639188---lanodovekoz.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080d26deaf81---36966944365.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2c7a9add98beb7c42fc310ca028735cc/51539446982.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/720dcafdbc011bed8d299e4a23148bf7/8952596922.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vacu825venr9gb9g2ivs56ucr2/67529595507.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/ziwubafewinilogofow.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/302db5ebacd5502ad4ea730edeb303da/70925682561.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/80035022555.pdfIn PDF document text
    • https://fultoys.com/userfiles/vawazove.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a28e2733---23068343540.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108160643581134.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6eaa1383---zaxafidajave.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/6044460507.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/geroworokafuxetonibi.pdfIn PDF document text
    • http://cochu.net/resimler/files/99872121421.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/xulizami.pdfIn PDF document text
    • http://veivel.com/userfiles/file/pexekufuxagamim.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/talegemuruxedufalifafojo.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/44795599139.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/klnlaqb32ms6vrtc6tb6bnjgr4/zomabozemetetif.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/gevasuzazedomimova.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_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 10112 bytes
SHA-256: 19741b63db2cc327927543cf99f923819cdd5fc6dc825fb70cff1d0b9e154f19
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16476 bytes
SHA-256: 3656febd3ad5150db67b19dc225cf03f25556bb0e627edf8111ff1707786de51

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