Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fbd24d1953c7d5…

MALICIOUS

PDF

175.3 KB Created: 2021-07-22 21:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf1f0cd6ed4ef2dcd57753a9e258032d SHA-1: f0d0c0186b0da54cb8c87aa0fcc1237d06c433cf SHA-256: 18fbd24d1953c7d56db543ad1d555bc38afbaeccc0e5dc75256a708166ad4b8e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and utilize disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vjbt95dj9uu8till2pk9sorvjr/toxopowepuvapogigivotop.pdf In PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rakopumobixig.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nawesafusej.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9ed0cf390ec70ab7d802e0056aabc676/vedadajonomijonurusewiwo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/73aujfdkr6crab2pf25lbavvsc/vilowavid.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a38265aaf70---32542166188.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a4f457562---86381409109.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/75229005008.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/lamir.pdfIn PDF document text
    • http://espokebar.com/uploads/files/56644509830.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/mesagoboxixegaze.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ac3d9bfa102c9616181482ef7d3bcb8b/56328833638.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098deae1aadc---86391544419.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cba41a18638aea11954be0412aeaf135/84134220387.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tmbpvs47npivvn72brcng0q7u3/zuforefanasukibed.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/59ep0gg456fusch2imoc2oivtq/balezon.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bade37d9e97---sojow.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/31782773466.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/v5tbafhiebk7dsuuijps2s92ui/81139745537.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470225de1a---73311586163.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/22361912890.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73bb8e2d6---46227127312.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mkb8k65r75pbatua46cp255p4i/82614962733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=combustion+in+compression+ignition+enginePDF link annotation
    • 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_off000247d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247D4 10780 bytes
SHA-256: 32e9ee53342e72725a4c17b4dacb54d1b611aa9facf111558f2b84f8e9877829
font_01_sfnt_off00026076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27888 20988 bytes
SHA-256: 343b352ed93ffc4080992e32408a9d240e9b2b0fed617ff2d622f52b5e3b572e

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