Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c16cb84c61e6ed…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 03:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 583faf5946981f45f6e0511b65570b5f SHA-1: 721a8422fec1d6ee90c7bc9029fff551d996ad7d SHA-256: c3c16cb84c61e6edaa25d47e1a10d0e0f237c2015f7b860e7792ffcaf7e9706e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/3a07fe4e2be4d0057fb0c9aed8cd0554/taramevelusesu.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e3b9140b0f6f501829c6baa56ba8e6b8/taxeviselagolemafeleti.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ab596ecd4984146d2552e92c00861b7/97172554674.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73721b8a98---74830795587.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fe46eb46---88105864708.pdf
    • http://csc-0411.com/userfiles/file/20210619202931_rxk6y8.pdf
    • http://assushop.com/userfiles/assushop.com/file/jesolelodadinerutudimes.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dba94ccb---45202799958.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935621d0bd1---fesowetij.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3f1fb0508---fosixu.pdf
    • http://www.niziointerior.pl/upload/file/67447647271.pdf
    • https://condicionamentofisico.com/arquivos/file/77406916737.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447045dfb0---mesuzumerukozepujisobuda.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040c16c591---33270023928.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/foduni.pdf
    • http://notarbrazda.cz/userfiles/file/68943634125.pdf
    • http://hanleyresources.com/images/89873934051.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a01d29f7267546f8e555f23253fa0d5d/jonitumo.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3d067824---jijedurisojaxivugeviko.pdf
    • http://hopkins1983.com/clients/861771/File/varabarokibo.pdf
    • http://sahamit.net/userfiles/file/28328218009.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/68cc1ebdc1ef0e6b13fe4bfd966d7c61/44316196139.pdf
    • http://arunimaflavours.com/userfiles/file/74716615235.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6879217375d859ee84c00c739517f094/zapiniwirilidiraro.pdf
    • http://udokutscher.de/gfx/userfiles/files/fazafited.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=elevation+and+depression+calculator
    • 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_off00010528.bin
b1c60b485f70e26b054be654fab582988af87dd7d8fa9c9ab15cfa5e5ead2052
pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 19136 bytes
font_01_sfnt_off000136df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DF 16792 bytes
font_02_sfnt_off00014ef6.bin
eb364786382dd12d0aabb4a06e47a0f75a4e44fcbce9eca258adf7d2fdb8f823
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF6 10656 bytes