Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c281d5132e142…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 20:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb26c002017a8a1f189abd91ca3c5079 SHA-1: 3199568a50fbe71a40a239f10c64d77e0d5df2a6 SHA-256: 0b9c281d5132e142c4863ed2c5a57eb1b27510164e2418c3bab86d780b37a5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=download+travel+boast+android PDF link annotation
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c8b5876d---1561612074.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/rujemuzefezedibuj.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/87647387673.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/34551584886.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/fukutabivasipisireb.pdfIn PDF document text
    • http://watch62.ru/files/files/27626178845.pdfIn PDF document text
    • http://vipdiler.ru/files/file/39441233800.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/ledarogepewujosemin.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f032166c1b---goxunetudevep.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/55645602619.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/90039895023.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/40632343930.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/68609815309.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/2789875178.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7429921ec---51987421464.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/foniviku.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbdfe516c8---94740868176.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/poditapepilivo.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f034d622a9---87097413371.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/gitezopo.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/retojevederiwozumaraj.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/19549609759.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vovimujibirozajonilum.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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 10536 bytes
SHA-256: 5198fd88a03e5e18e65bbc387e99a34847a2adad8aaf54354ea41a6872b31584
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 17560 bytes
SHA-256: 1daa2bffafc878db92b477cc58d6f0440d546f3640c550e08caa74773492a213
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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