Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2419ed560e19fb3…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 16:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b8a77f71901a1959943db6df20a8ee3 SHA-1: 7b5294234f844e9c6b4338b9bf15202105da54c9 SHA-256: d2419ed560e19fb3f257886f64f620ebe676b2aaf5f2cabb9193c0d3dfe51b1b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to websites that appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to lead users to external, potentially malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://aiswaryamatrimonials.com/fck_uploads/file/80598070939.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440c36f670---45329965419.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/fowemedala.pdf
    • http://syarmarka.ru/userfiles/files/lixigov.pdf
    • https://dacola.com/upload/files/filutiruvake.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a9d819b9---bibirovilogaf.pdf
    • http://firegallery.ru/img/upload/34517334527.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7218697ead---ziwunodebomefepogo.pdf
    • http://hilltop1976.com/clients/24685/File/4529758211.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ea3a2629159973c3c2d9278f2fbba8b9/mitimun.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071dee205732---52077207813.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607287aa890de---seweraliwewafubelodibomin.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39847161257.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402e61e58d---66746632486.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/65166877855.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0af9eedb5cc919850edfcf73f3911139/124012909.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3b03519078902353ab95b47fa9c8b8d8/wewajavekinavupu.pdf
    • https://laps.pl/userfiles/file/gosowatalisotozipite.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5249321c3d7da2ebbbf82e70445e543a/kunodaragejepenowedivul.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa0dcf648---14351458037.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f35be838608cdca43d36a0c507b351f4/paxibisapiden.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97421a388---lamabifufonerimo.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6b0800fd4e5111be7c38232f5060b48f/jitazijosokurojewotapole.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754836d0b9a---likejajajewonaxen.pdf
    • http://robwalker.net/fckupload/file/58303454113.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34749e33a---tedoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+corbett+national+park+is+located+at
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defa.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16100 bytes
font_01_sfnt_off0000f436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
font_02_sfnt_off00010c4d.bin
84daf0a9070b3aec7d4c31ac1904ee52a076d128acad4731bb73ed7744c646b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 10808 bytes
font_03_sfnt_off000124e6.bin
b9087b8cc9898f661c74b71384282bf1f87c8635962b299a11fcc7f994a512a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 17024 bytes