Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc7d561341c6788…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 02:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6c310aff949c3db79ec89e0a659e5b7 SHA-1: e6d6a8ed950a313a36904342ef59280addaec9c6 SHA-256: cbc7d561341c67884d47a291f7e24ad9900ee8109fda805573a172d308c198a9
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF acts as a link farm. While no scripts were extracted, the structure and URL distribution indicate a malicious intent to redirect users, potentially to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5beb753b---famegobizimutowuvinuw.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac102c4fe1e---13645571752.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/88610637397.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/81cc8a4f5b7e7daa111938c92bbf464c/29149366058.pdfIn PDF document text
    • https://felicityokolo.com/file/dajelekonazevi.pdfIn PDF document text
    • https://phukienbep.net/media/files/lenusa.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i4rb5ankk8kf56s2gbbv262vnf/nowelovejirosi.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/lerowezapidezoxefukijo.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/nupekakufefaxaxit.pdfIn PDF document text
    • http://metallpress.info/files/mujovutujajusemefironop.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b4ef948c7---pugelubu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b532c93ebad---71309429824.pdfIn PDF document text
    • http://kodemari.info/data/files/63475711354.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/58d9a1b40c53c25a53846c0fa6fb8039/jozigogazoxogafefipumege.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/jowekemukipobuzimewome.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f9fb1d38af9bb8d23982d4ada0d584e0/rukamuzufodejedi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/295eeb120146a0c38f34246f16410363/59070078056.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cidrcflgjfrjjph3m3a2svhcid/35372084604.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/72348754043.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/bijulud.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/8333729524.pdfIn PDF document text
    • https://anaksemut.com/contents/files/pozevesetunuvojutavut.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/wuvivir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=midnight+the+stars+and+you+piano+pdfPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10940 bytes
SHA-256: 5683dc9f48a995cc7d3de7c3a2b16ccc71d31befbca480cf4e58c980953a672c
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 18332 bytes
SHA-256: 830e0ae8e30190001c59f0a2a22cb1e42029bff0e7d577732eb426cf6f9db36e
font_02_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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