Malicious PDF — malware analysis report

Static analysis result for SHA-256 171676742d328212…

MALICIOUS

PDF

95.3 KB Created: 2021-10-10 09:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55706154eafd5fe0394a215238cb23c4 SHA-1: 1437c1a6dbda4728228ed49e0eaec83055bf8c1a SHA-256: 171676742d32821237bd9bcfa4052d4dbbc83bf51e99f77b5160198465c205c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, indicating an attempt to redirect the user to external resources. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score suggest a malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://epicridesnepal.com/files/42590602816.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f9b6b1f9594113f335b315074b3f94e4/38278643829.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/faforaniwife.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/34838822348.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/19656804632.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/2565812778.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gijepexalemub.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/16693042323.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///13275897089.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2rgr3fjpn8f9tk6mogttpf0r53/72273465894.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/91955758192.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/22498315602.pdfIn PDF document text
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/75848907364.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/12392715907.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/21382160725.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/27113050549.pdfIn PDF document text
    • http://youil.org/userData/board/file/20907067952.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/76642567807.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/piravilebejunupuwuxalel.pdfIn PDF document text
    • http://hodori247.com/uploads/files/golazimananenivofunegonu.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/satolazukobidukewonuki.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wemudeveturalovonepe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ab9c37fd---zadodinutemopovik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mage+fire+pvp+spec+classicPDF 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_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 19064 bytes
SHA-256: 62a166acda32b744afa93d9c83f21d588b9331670eaf357c004f49ac44a6f0c8
font_01_sfnt_off00013fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BF 10392 bytes
SHA-256: 3520b7470f6c60bb9fde5124ed92b521eac468b8aa91a7dbd9e9047f13c5b459