Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c764b320462778b…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 23:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a779719bc5424d7d09ce80daea60ca85 SHA-1: ea6cdc766a4c22c8bb8d3cf0ec6b2e2f8bd1b5d9 SHA-256: 4c764b320462778bb854e055a9b264a6c11c3550abc6979e2c07e50cc4fe23ca
204 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for browser extension installation, suggesting a social engineering attack. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware delivery attempt, likely involving a malicious PDF or a redirect to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://hitecds.com/userfiles/file/mezizafakotepiwizo.pdf In PDF document text
    • http://remont-elektro.eu/archiv/file/11865990987.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497cb2d8aa---gisolimosaw.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f796b5b65f---jakike.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e38929f4---wogexezoxov.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/iisj6g8qaa21qkfppcg0rd82r3/79149201498.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/89949744971.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08df9af9390caed2f73b4e5979f82a59/40905971032.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/17738697477.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/4327971068.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/36680909366.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-18/20210618175021358629.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358eb4de18---65782498591.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/28274163880.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607165ef3b4e8---82422745906.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/907d239287cd36cfd56fd3e68aecd2e5/kiwijovu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/12544272285.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/gubafu.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/84698781653.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/75c9b2582ade9c52a1a9db04ee6c7721/18915427156.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b773c3c5951---lipafapuwes.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/34933154914.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/37432f9e72d61adc6720ab82ca12b389/97823174002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rpt+to+pdf+converter+software+free+downloadPDF 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16832 bytes
SHA-256: 5f099b640664edc2da93383bd8cfc430e4d76410e99b43a2e3fab2621efc73d9
font_01_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 10716 bytes
SHA-256: fc1562ad196a80353933c0632256cb602d53419b7dba1032e5c4901122cd7e61
font_02_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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