Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca9b16b16cd0eda…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 10:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c25adfcd447bc054d8c0e2b6f93f94f6 SHA-1: 59d5d47511891f54739c07785ebdfbdf0365d4ae SHA-256: 1ca9b16b16cd0eda926923fa890c8d1d5566115004341b57aa45915ba03ed1c4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. While no scripts were directly extracted, the overall structure and URL findings point to a malicious document likely intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ergakiland.ru/files/files/2665999189.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347f91cbf1e---2062392969.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/33a626d55176ce319c9d5da6df92442c/78586519285.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81558bee6---1159930151.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/fonasopevujo.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/xubiwerotiwipupekufali.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/12bd9acce979c3d834ff4749e34b887e/8795875298.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bf2facd89---10319972557.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/misukezizalamakibufogaka.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/xinotuzepigejifetoka.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091ec6fb1d---wejaxiregekefubufeweku.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/9893247925.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad454be0eccf13fa9ca534673b373c37/25438523101.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mudaredasawugefidijebegoj.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/i8ka6jri2hgp98a5hvb9o0s8u8/suwurixebevado.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/17542747302.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/zarifafixawusobatifu.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/91594382897.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/kejilisebozu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0b161698---3920316492.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/596e2903822001fef9a0d1e6f93d2741/lefipelopimez.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70h81vdeioe9vjo7ppff1e00v4/filinefagujin.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e1ca8cd8e4d4509ba74bb47976882f0f/22678105559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electrical+circuits+worksheet+ks2PDF 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_off0000c791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC791 10604 bytes
SHA-256: ee1e285a966fc77f8123388c944a2d649c3c497daba07e7bd64c5ecbccc71633
font_01_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 17000 bytes
SHA-256: d39b4ad44389c8e38fcae4417c346c2829fc414c12717789f208db9db7c7b977