Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc44a2dc12382c5…

MALICIOUS

PDF

80.1 KB Created: 2021-08-07 02:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7047f366d6a328e11aa4dfd33afe393 SHA-1: 71803eddfe0a9f409d27d38b6a21e187695420c8 SHA-256: 3bc44a2dc12382c5f455bf2a0a7fdc2adfeea77fefd69870408f48056fcaa143
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier strongly indicates malicious intent, and the presence of multiple link farm heuristics reinforces this. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=bulletin+d%27adh%C3%A9sion+fcpe
    • http://renovfab-menuiserie.com/userfiles/file/1211877243.pdf
    • http://innovatepc.com/userfiles/file/3586820955.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/53010319656.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/48528d28cd3c09a070c91837911852bc/kavofas.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/jumojaxuvuminopodegabis.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e118f13d7f6---16690897307.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8151c00c4---38436680954.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd88e9c0db---52072484296.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe4be4d04---gurinis.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607306847bbd3---71165245527.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/26731959962.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf9ad2e2df931a835cd560286ee4267c/nozaxomejokewewajowab.pdf
    • https://cafe-malaysia.com/contents/file/79524364610.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/154eq9q662fjjb4trmud7as6gp/70034125200.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210620_B91528C136449BBB.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f28b47a32---57602292246.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c873c5145---2706800075.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4b278d48---rozegofufus.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tbgm9ag3ojd2u0baild8sg6aru/95302579231.pdf
    • https://yodishit.com/uploads/userfiles/file/nukajidugologilajovegopo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b33be5b0---zibirozigomi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebf98e078---33345545620.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/63030830407.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487698532d---35764729641.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5798b4c7---66416291468.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d195.bin
5a3f5cf583294a21335ddf2f18a736c1f4550b48621a5512ebdc5bb281fa3d35
pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 10956 bytes
font_01_sfnt_off0000eab1.bin
b80e3b949bff7e5d61e945f07ee294dbbf9e4619e9b9663244b8efd306b1755f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 18308 bytes
font_02_sfnt_off00011850.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes