Malicious PDF — malware analysis report

Static analysis result for SHA-256 a932680bed270c2d…

MALICIOUS

PDF

115.4 KB Created: 2021-07-31 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4755d1059ea74c4224792493fa888d0 SHA-1: 63455c4d149626c18a17f24faef9c69622995e10 SHA-256: a932680bed270c2dce329aa56f6b793cf03c8e54436de332b30b0e03f18e1d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, many pointing to PDF files, suggests an attempt to manipulate search engine results or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://misspacificus.com/clients/873634/File/tiwegogagukuzulu.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b7aadc96e---77754639914.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/11422038347.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/nenapuwikoxegeja.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/nifunu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a85467dd---dezovusukavinudole.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce670106709---lilobiwifulu.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/jelug.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62a0995d---14055150030.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3r2tp8uf5jp1fv6e1ov35nh6b0/xutani.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/burosubogidala.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ecbaf278010a348ca1165ff2180bb3d8/nafemopujejirubotopur.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f0etr6karqggmmksr1ln4iidr4/xogubedalememifidom.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/remazibosetutitavabenefaj.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/v7gvq9fa91jpr37kid7597rsg3/15198201943.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9cc48a782cbf0f15d5b292ba2630fac2/5338420633.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd5520cd8---27408848167.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dc7c6b86---25236857163.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/62910028410.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vewanutavof.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160920e6d9b37b---88277463202.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sirarubikatuvuzufavozoj.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/58513840299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=geekiyanage+physics+books+pdf+free+downloadPDF 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_off000159be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BE 19592 bytes
SHA-256: 125facad2952807578a50f693896976a01890db4c75cbeccc67a173d01c931a4
font_01_sfnt_off00018b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A390 11272 bytes
SHA-256: 22b05386a29e67294912faa670b434e83fa983ef18a3032a8e31702797808022