Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedff95f7e14cbc3…

MALICIOUS

PDF

75.8 KB Created: 2021-08-11 22:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 944b3209c3e98e4d0d1a85861ba49c87 SHA-1: 710ad1c1c6f6b1a6e9f12b43ecc428c7500846ef SHA-256: bedff95f7e14cbc37ccfce364c4181bdec921ff478c6a632484019c5aa8e51d8
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 compromised CMS uploads, indicating an attempt to host malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts and link farms suggests a coordinated effort to distribute malicious links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4517ebebbb---pirufusojuruxexabikuga.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8e44da353ff5833053bc76d6c3d7108c/68247755406.pdf
    • https://ottopianos.nl/files/rafabajibub.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb3f4229---37443019512.pdf
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/31060819567.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113009fd8af8---vupetakerilo.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ca637718da35b1750ea42121a33e4031/zumazepijuginilur.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/xakexasesadijepaporo.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f985d2d8f---jejijapuzejutebuwe.pdf
    • https://dunaweb.co/bg_image/files/23616155455.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/74gun13msorsl2nve9pjug6du7/vajavobebawiwixiwoxe.pdf
    • http://afghansolar.com/userfiles/file/xutolefebusafene.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h2umfbk2gjk9ug7387rf6gok9s/kajetidabido.pdf
    • https://micro-logic.ro/images/uploaded/file/83872331705.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20ec7dc1b---wumivukotofepiv.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9eecf320bc4569d1e74fb34735eae5b9/rirumedizava.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d001b63015f---kiger.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b069919a63d---87622655928.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b2049c5a---49391779414.pdf
    • http://area100impianti.it/userfiles/files/8062101440.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1c384be3---55630108828.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082542d3ce61---kizoziji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=movimiento+circular+uniforme+variado+ejemplos+cotidianos
    • 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_off0000c47c.bin
5204901cc554072f5e80a58a8b36ec865dc336e4c847785a3e0c0428d4f4284f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 16836 bytes
font_01_sfnt_off0000eee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
font_02_sfnt_off000106f7.bin
1a122712d0c4dbfb81e3bd30c04227022ae9ff30eaec19dfaeb8675fdcb3ec58
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 11072 bytes