Malicious PDF — malware analysis report

Static analysis result for SHA-256 26671b2c52a2d783…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 13:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61cc1175ebc712fdb3c6fe802ffeea79 SHA-1: a39ebbdfe6e543a83dd92950a59c93eb680c3d5d SHA-256: 26671b2c52a2d783e3f8fb3a8598c0158ae1c2d8d73aee74459df6bc4ec546e1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7b4de52v188ch6mguje1aev5uo/xolovafokelidisupomaw.pdf
    • https://gotoko.com/cmsv2/upload/files/80120798228.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/33650294654.pdf
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/43476877838.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc34e8bf5---badamev.pdf
    • http://zhhyhb.com/uploadfiles/files/bedutizilenojedukovuki.pdf
    • http://universe-micro.com/upload/files/20210623_002754.pdf
    • http://pnmanagementsolutions.in/uploads/makenuxaxejurif.pdf
    • https://sjalikave.hu/pictures/file/24473237250.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b9d5b86bf---xasenelexofijuzupuwu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b9c3adaf---66243697920.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb169e346f---ruzigemilibim.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd5269ed4f4f1ee05206463065fc4e14/vivefefeku.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de03213e65d---foxirekojovale.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610108e7689b5---volin.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae68eb1b0e---lexusosixoruzuzeb.pdf
    • http://healthywithhart.com/res/file/newomuperegovimu.pdf
    • http://leaguengn.com/userfiles/file///78650549127.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/r7hu2nmcnaaf5dbn2til1vf7e8/zazuban.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73addf1e---31720383970.pdf
    • http://daimarconstrucciones.com/images/admin/file/15256782353.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fbf2a612---17300738361.pdf
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/18336923655.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abfef38e109---sezox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hlc1700axw+service+manual
    • 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_off0000b755.bin
40595f178d51313e9a7261bb730f74158c3a669c72e57c5e46a4e6ec49c07a59
pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 14268 bytes
font_01_sfnt_off0000dabb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
font_02_sfnt_off0000f2d2.bin
f9b86b069095f587cc8f101dcd4af088e3849b428d793370290605682a186a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10740 bytes