Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e8a1eaba87809…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 19:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e73419cdc2f0c2e39f7d9c9179d3ff48 SHA-1: a907073e248dcd5b267006e3b773b29ca5820852 SHA-256: 767e8a1eaba87809cf9ac57ad88528dbe013c8fe09ec00c2f97296a3f93c3e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/26e0bf574e058934aee7531f249e35bd/sakegatevapuxo.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b06f51f75---18894376312.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f125fac8ea---86591729092.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rubovelibum.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/436c0abdac3d82f62a5d8f01de4e855a/zemokoxaxuzev.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zekesowobuwosuxijorarofe.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/94204513352.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/24135032210.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/j0u8mtrrp5g0ur5o0i8rg117vr/jebupijogonivovawonep.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/losalerogaxuzelukovatonip.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/sirumoxajetujufo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118dfdb73eef---tebow.pdfIn PDF document text
    • https://norservis.cz/files/files/3631802419.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lelipudogezepo.pdfIn PDF document text
    • http://sentralperdana.com/file/45970343628.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jerovigoves.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210827_185136.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumenavokenajorolaso.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/xabutupitaxafiliduzo.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/kijibolupilinisajobi.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/3038091501.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5e850b7d---benezoxusifopolenifik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fundamentals+of+complementary+and+alternative+medicine+4th+edition+pdfPDF 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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 11220 bytes
SHA-256: d321e36b71ca78f6d2d0d9c33acc0601f91e690914d8503d2cf791f40bcdd665
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 17672 bytes
SHA-256: 1f443fae744e1b4f6ea9ed0573673f74b9ba24d9cf27aeb9536650ebbfdf5b27

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