Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb3ed1d079dbf07…

MALICIOUS

PDF

111.2 KB Created: 2021-08-04 21:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c97c3bb7554a9268cc2a08042e2487a SHA-1: 40c5c0f9f856f08e6b5808081934a5d047c807a4 SHA-256: edb3ed1d079dbf072b2416ba681b5daa004b04fe015a8ea2b05c20adfe3bd81f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress installations. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links are intended to host and distribute malicious files. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ankaratemizlikcim.com/depo/sayfaresim/file/63714485308.pdf In PDF document text
    • https://magatek.com/documents/file/70336129848.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940c9711202---49681704823.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/22023417043.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3dd0b4d1---95287778273.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xafofamexolofizalozezuf.pdfIn PDF document text
    • https://soechi.id/userfiles/file/88975891183.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c9bd510e404076d168f0d237cd8795b2/wolam.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ebc1a1aa---2772131429.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gv1ies8d6kje0tuunce4qiup4d/xapafizirikemaj.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3d4b9ea9---49549268574.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1ff5d945---dupijov.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/25873679346.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/203665654960b5488dc0f58.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607850de1b08e---11265280745.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7cf25f0cd5f61a8d429a2ed8f982b4ff/febodapigiker.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/90119447819.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/j44jcbqf1lmva41r92n7hsmi5c/79619197728.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gelutazu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5828394a5156ae58fb46faaa25544738/vekifipe.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/porasafawa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nnfr3ij5l4968u9v9uijnrslku/lapokibun.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/54101687700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=programaci%C3%B3n+lineal+investigaci%C3%B3n+de+operaciones+ejemplosPDF 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_off000149c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C7 18496 bytes
SHA-256: 1420d16ddf07c0e305126c1c58df32e50f71a96032bade858827f2814cff8e8b
font_01_sfnt_off000179a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A6 11192 bytes
SHA-256: 9a99c91819d58a3d48036e240f3053e83235da5a714c127d344ca7f2ef67657b
font_02_sfnt_off00019363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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