Malicious PDF — malware analysis report

Static analysis result for SHA-256 303b37e9634f7405…

MALICIOUS

PDF

90.8 KB Created: 2021-07-14 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94d0e22b77f24e9335a9c9e3cec2b6c5 SHA-1: 4fb7264f33a72abe1008bc72df0302d34ac9ec16 SHA-256: 303b37e9634f7405a4bbfe3549cef56b7d4483d672e9f2b34a7fa7a57c28e17c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=hotel+cecil+ghost+adventures+full+episode
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/02364428d0d1312a98db7de26f28f634/gomujokawuxufivux.pdf
    • http://amesonsofallen.org/clients/53156/File/vegajemebameb.pdf
    • https://questyme.ca/userfiles/file/7720438800.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddfd30ce5---vonivove.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/46e392187cb8e78fe4913f15d58001ec/nuwogijugojibejomedipoxa.pdf
    • https://discoverthesky.it/file/4458069412.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/cc160a00e13d194684ecbdf1565da6ff/jatim.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q48ek7v96ofpg3hts3t4a9ppib/sijovina.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093159b03538---14106913195.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/rsto7qaniu2deok9k606nnb5s5/zukuroxodogizasu.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c258149f9a5---loxavopofapo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346fc39a32---paruxevirajarunokebabo.pdf
    • http://docando.es/js/ckfinder/userfiles/files/xemiwi.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9adbae5941561a90baa3e8dacbc758d9/39901142149.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/51728227049.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2e018128---xejexutolojopidiputireno.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160892095cdd8b---36043273571.pdf
    • http://aelma.com/sites/default/userfiles/file/sawuxegofolubozipepipura.pdf
    • https://inncredel.com/uploads/remivabetot.pdf
    • https://seikai.jp/free_images/files/37361269186.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35e2798ec---29688144686.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/pemugerinumugojemufutofa.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f12771694bb4a6f2c99559002b881b6a/95567188153.pdf
    • http://busankid.com/webfiles/board/file///83055877657.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin
854fe17f36a2bfc2565ce93ae16caa530df2c641613791e598be96bca717aa62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 19212 bytes
font_01_sfnt_off00012a7d.bin
44fed1950b562d440d8159992e2d405060ada591b819c68a24dff22793889616
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 11056 bytes
font_02_sfnt_off000143f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 16792 bytes