Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0b39deca812e95…

MALICIOUS

PDF

89.8 KB Created: 2021-08-14 09:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9345fdf448d167b00b23c4c5399fb3f3 SHA-1: 45437808952189446dc1b8f047564f07b4fa7fb2 SHA-256: 7c0b39deca812e95cf92d46a63995a73759181583e21e6472edb369a93dbde24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be downloading and executing a second-stage payload via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gibisch.com/files/files/53870016260.pdf In PDF document text
    • http://geoman.cz/data/file/zowogipinufunosoberagexok.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/94475351181.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/molilada.pdfIn PDF document text
    • http://hydrem.ru/images/file/vategojojimedorabuwepa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06c4083e3---67471404267.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fbca7f88a---disanopen.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/15560757053.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5b0174451680836697c294d6ef32e1bd/dozobizuj.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/zepalozakit.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fa7sppckq490p8v5tbuapmmrar/48115346005.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c55a2611917933766671966b5c0e4786/64624638032.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17221e47d146c4dfd2a47efe0f871645/14792158913.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb2b98d2---sapesutajajoromodegudumi.pdfIn PDF document text
    • http://kgmda.com/upload/files/74812932829.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9ffbca3c72fae2b92b129d2f8203281b/jegojemanawimibala.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bd8d6c0f47afd9007a4c4b369b688fcf/pikatemujisufa.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/lezozurosewem.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0f483129---zoposokitizegalamodo.pdfIn PDF document text
    • https://agermag.ro/mm/file/wosaw.pdfIn PDF document text
    • https://badoza.net/userfiles/file/96070434199.pdfIn PDF document text
    • http://i-dron.cz/data/file/joxidiwekozefe.pdfIn PDF document text
    • https://peterdegendt.be/file/papolikaligetuxo.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/bejav.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/63248026c3a656a1ea20a2afc68f63ee/2518674556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+big+chip+on+your+shoulder+meanPDF 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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 17936 bytes
SHA-256: 78d8c22ababfe2e880eb5aeb4fc9e11b0665687daf36ab7073021b9226c8cc8a
font_01_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 11308 bytes
SHA-256: b09627f4688f1a786416a284bbec6db2a90b6e06876a90ff539564e9655506de

Open this report in the interactive analyzer, or submit your own file for analysis.