Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6df55160d7ec888…

MALICIOUS

PDF

86.5 KB Created: 2021-08-19 17:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c5ee75b75aa97355adc0f3827f423cd1 SHA-1: bd3a1ed569a7171150ba1d7f13c4984fe1e1f9af SHA-256: b6df55160d7ec888638589110780f8a5141922ef0e0d0d582d64b9a6f00d3560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on potentially compromised infrastructure are key indicators of this attack pattern.

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://pixomot.ru/uplcv?utm_term=what+is+the+meaning+of+financial+autonomy+of+the+states PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e813baa3---kares.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094157255170---27414757056.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ruuetnutucqoke4lf5ep57ca4i/80234341586.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/21977633629.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c2dc5968a258e652dfe6d8c825b2b62c/78398131068.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074723b6d92c---totujategiperulefusosupol.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bbc4a326a596310a0334c7bad5b77f36/bonaguwanovakeku.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/xubiwutusoxerovezagiteb.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/fajesulesufonabi.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/35070112787.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/59202b724e5f006cdd8495312c43aa42/63638752920.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bp758sio4bq2pgpcr6h3j7v67s/kegufixumabifa.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/loranixo.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/94306768921.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a78d4952a---34231571563.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39406761a3---95528265761.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/87481099095.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/28deff9591c95b7f5e9d2995da60e50d/mabeg.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6864be125---44830407833.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/66390256514.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccdf721579---62006049127.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/86919269444.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/9664404628.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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 17880 bytes
SHA-256: 961f5e0e42239c38c80d37d5d5ccf6751d4041bb10aae5dc2901fc3bad3e8f48
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 10892 bytes
SHA-256: fd1fbe6d84d33d3a394d4a32fea624e406e2dc8eb5e023d78d41ea721da0bfc9
font_02_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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