Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdcedc637d13a09…

MALICIOUS

PDF

75.0 KB Created: 2021-06-20 07:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5c80578aaf3625060e70120bac6734b3 SHA-1: a71124bc27477cde7a24dcf8bcb5d1fe4fa2f5b4 SHA-256: 1bdcedc637d13a097573d04343115301cf104c2e57f9781107e9d0e47e002824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://irlanc.ru/uplcv?utm_term=physics+formula+sheet+for+neet PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d45b631f---jaxulika.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/788f99a1dffc3e4ce2e38a21a686653b/68109935645.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c01df34---79244153368.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b215ce66e65---45997146330.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8e051e979---fikuxisapaxumajogit.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tbb5bjj7v27gn1e1hnpgl3enkc/pivitipexenevu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4bd89dfa---55158075296.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40055506826.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/46015676500.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/34168524292.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/79804707998.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/83393645818.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/bapamome.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/madaputasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 2900 bytes
SHA-256: 42998d7cf5d458379acab8e4c92dc943ecd8145598a929d3c91ae73e5ba667d6
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5224 bytes
SHA-256: 913bbac9fcf0326a4f77329f56fa18e5bd6571662c5c0318a93dcc19c5518184
font_02_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 1712 bytes
SHA-256: 043ce574478d974d246227585662133978439434228caaf8a5ac0e7d12092581
font_03_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 11108 bytes
SHA-256: 6b7e5126bf3e95b7742381a5bea2f7dc951976d350ef493a6f4cf9ff612ce341

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