Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4d6ea0edbf59cc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 04:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94af6d1ac700ae39177cd406d8f0a6d7 SHA-1: 9ca4daf78a73eaf6c8917e14312b1d7b80906b2a SHA-256: 4f4d6ea0edbf59ccedfa3eddbc2ab09c3bc27c50bf3925701ea70b92cb1cec81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm potentially hosted on compromised CMS uploads. The primary attack pattern is likely phishing or malware distribution through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=lake+house+streaming PDF link annotation
    • http://trevorhannant.com/77946054184.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/84143988195.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zibuv.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/86268629372.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612edebde39eb---30288774230.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/ketone.pdfIn PDF document text
    • http://farashimirooz.com/files/65910808050.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/kewadowisu.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/83949137689.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/32481976510.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf7a48a19---sowofulumufekalex.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/80268723346.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a391c0291e4f322239f64cd8037a8482/garigivekedavorukedi.pdfIn PDF document text
    • https://businesslife.com/content/files/giziwegizototolin.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/lavodowep.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/29784842815.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nudufufuwufoju.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/65878377023.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/5586697487.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/zebofalu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/14329345632.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zugokagota.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161360450119b3---88114035582.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613761a2c946c---bofilutifofuwegop.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7bdaa5cf---wigitikijatimelopif.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10660 bytes
SHA-256: 1c74c77d19e22c12241542a563772a137e497509d7f30a140ce0365e20d4feb4
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 18684 bytes
SHA-256: 011aaaef98c6650239e8cc1671d0e879bde5411af30fec0d1b1cfdda6fb78b6c

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