Malicious PDF — malware analysis report

Static analysis result for SHA-256 399f6e5f2accd4bd…

MALICIOUS

PDF

82.9 KB Created: 2021-08-10 00:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ae361b20f0a6eea481384d7ea5244c27 SHA-1: dc8f0cf962418d20487207698c761a9375019347 SHA-256: 399f6e5f2accd4bdbb13cc3f21f91c6041f9b960010e93fd2a9d2d00f5811d23
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=roblox+speed+simulator+codes PDF link annotation
    • https://toolsatool.com/userfiles/files/wugebarixifosikorenula.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/vutekuviwuzujujusunekuk.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jufowutilonalabemikokade.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8baa686dfbe597796aaa8e5af832184c/mokinudimilovonitusemad.pdfIn PDF document text
    • http://scro.ru/pic/file/13484311628.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/16ce108c631ae8279a5a4a95b91292a2/76432969031.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/64263966009.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/n2j0glg5b5jlov17a212q6g2uv/10106382376.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s3af1l7l45063dcft3jd6l1ou5/36273896901.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/87817674405.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f67999229---lizibojokofenobotig.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/31105555060.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789d0e2f68b---94146680878.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kifekedemoma.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dae08f75ae5a4923178eb852ef437356/komujusinedug.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/23343af6252d92e6b94dc58e65368652/wufolinesara.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/23198897101.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/75448730036.pdfIn PDF document text
    • http://medica-brno.com/files/74599910483.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dda514e219---jagavabuneloketulateta.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/meramebupijejep.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e120e6a0f1---97796155990.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/32443970781.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/28507522204.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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 17556 bytes
SHA-256: 90289ef9ceab8648daa632ef0855a89854eafe2d8b3ebe5720b9a8ccf0cd8bde
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 10960 bytes
SHA-256: ee8cf84e3b1db1141066d3730cbd017c902ecda9807a8970abb5b8823610abba

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