Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7debf33520b363c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 20:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a19821875a157097d483d1f60912e091 SHA-1: 3676957bb074e308c0803a45e6913e9827d4d529 SHA-256: e7debf33520b363caac5a2729dd2c8ae022542b553f3f205a57ea5c18c4fabb9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript suggests an attempt to execute code, likely to facilitate further malicious activity or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=list+of+browsers+for+android PDF link annotation
    • http://vladekoservis.ru/files/90935997739.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/manegupulawoni.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/54189411277.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/42616e90fd8d3ab8fef3e2856b9548f4/6682373414.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/50717015658.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109220432315612.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff46c0ea4---sakikoka.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/mikob.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/rekamiwamodokil.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jixoguki.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tumenibuzibevefo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/98556439729.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcedffa37fe70497214d5f386a2cb88f/fegobekaguzudodap.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c578e1ef6---61417344885.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf325e50ce---30363002533.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/80342985468.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/48842019403.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/monilabewokake.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32647976140.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/voxupifoxezef.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/foxejag.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/bawetepovov.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bosaxosuziferiduweturito.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/retazifenum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8824808---jujiw.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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 15160 bytes
SHA-256: bf717407765c703d6d5b3a69b07af33537a265770188b68fa8f3b04c4da5e5e4
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 10484 bytes
SHA-256: d70de56d18475944dea50954ad2310b555ac887ebc336742f21a57db03c0894d
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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