Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b3b78d3940fc82…

MALICIOUS

PDF

142.2 KB Created: 2021-07-04 22:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ef0320b149a9dea7fffe258b6a202e6 SHA-1: e44766dc9b391f9e7b3ec777e3fe1ff8c681e36e SHA-256: 62b3b78d3940fc8269e74439e69062df55b0438368a4d027b23ecf6048f9e1e8
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document is designed to redirect users to potentially harmful external content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9249

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://queure.ru/uplcv?utm_term=sorts+meaning+in+english
    • https://dhesient.com/media/dexavuzojel.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fedbcbf9c---zidavavokipime.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e1c63d2a978c103fff8ed989610da5b5/nuzazinunibajila.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/13886142237.pdf
    • http://abacusnancy.com/userfiles/file/nelemudutigajulotazil.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/cp38n39k0le4960r9kn8m9jmi8/70678068772.pdf
    • https://aydin-elektrik.com/resimler/files/rikorozo.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/71962d196a35159d8c5487167fad2bc1/gevibelidenivutodewiro.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021620442579643.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/dixenovisig.pdf
    • http://afghansolar.com/userfiles/file/nozeve.pdf
    • http://drivingschool-brno.eu/files/danaxinonud.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160911c5f95283---mexomexube.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/l9vgl55g7j4rpba52k5nn9vs9o/xaxetutixititor.pdf
    • http://capital96.com/userfiles/file/kegawipuju.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/11171124010.pdf
    • http://bhhangkhong.com/upload/images/files/67701505170.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1dba62b9---gamilulonulumezawixekomim.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/35067070327.pdf
    • https://szabobuszrendeles.hu/files/files/86444765401.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a548bb02399fb27614b0d2fcfd84fcd4/40697187390.pdf
    • http://sushimura1.com/uploads/files/dodulimale.pdf
    • http://haisushitogo.com/uploads/files/muwukujumumezo.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/68724750895.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b8507d3d142---92405267262.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001eeed.bin
dc83e696f674c3b59bdbde202a7fffa34b378812b394aced118ee8e06b09b667
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1EEED 31360 bytes
font_00_sfnt_off00013ece.bin
0db271053d59b0a77152d79048dc60ac016037702ee7b88821f1fba44253448a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 16088 bytes
font_01_sfnt_off00016f87.bin
6e33046aaf6995e3e0856c6305d99307a67d40a11bcd0a57d993ffe3e4d23abd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F87 35596 bytes
font_02_sfnt_off0001bec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC7 16792 bytes
font_03_sfnt_off0001d6de.bin
d1709dbcd53285638e6708d4357f1be86e67de8723cd7ac621a9b857a9c085dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6DE 10628 bytes