Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8507883de50ab…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7986e2a999b9e1ddb6fc03c6066e040e SHA-1: ff35dcf811194b08e9edee552a5aef93dbbbb566 SHA-256: bbd8507883de50abe005896c5556bb605eac6dd577f6d9e6d499090b86895e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=mlbb+map+hack+no+ban PDF link annotation
    • http://www.museopizarra.com/ckfinder/userfiles/files/81583239205.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/doroge.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/84676881597.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/97505574656.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nokane.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/94274513841.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/57173454409.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c508866f8---tifebezired.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/15461862347.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/fejivepozefape.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/30994595899.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/24430767536.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901125633366029.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/delifetofazo.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/6336440135.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/41022598632.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/jolazobokebopefejuzeraru.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/rivaxepevakufep.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329d71983ff---39951989080.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909033250443220.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/26789161038.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/segob.pdfIn 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://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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 17404 bytes
SHA-256: 74bb4af20d5e46e03d84449a9d57c1a7eb47edf62392447986c9634c31e66a67
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10272 bytes
SHA-256: 89b644346f519058aa71ddf8d25a872bf2732a3c97c78667dc7f7459382f7b80
font_02_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1