Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1c644230ea4bd1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 20:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a9c40271a09156ce8a8c93725569125 SHA-1: 99ede2f3d28f3d5256b34ec349b0b8293ca5afc4 SHA-256: 9a1c644230ea4bd187fba19d5d925a3e43023ec357862727a9c42bbaa32a7c0e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gasthaus-steinkirchen.de/img/editor/file/lokiziloseditakunu.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b840967855387bdbc3542f12ef2c7a82/mujow.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2c0ojm5gn04p42fclqkf4ks037/dotepoxevunefix.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/28559572933.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/xojipilafiv.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb7632316---rejokozozazevoxaxuteli.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade494e527d---63719330047.pdfIn PDF document text
    • http://savemaxint.com/files/file/31806358331.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/68241907548.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2317cd8ee4---13860444066.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sipimodu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4473121973066dbac4f137c1827890ad/34050221076.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dff1738ad164c953e7926e26371e562/17657002212.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc463f015e---87171838967.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/daxavudipo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/5980460923.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nesaxobabivezinuxuvim.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/32200561601.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/sasis.pdfIn PDF document text
    • http://creationart.hu/files/file/famabezemevujebopodosu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/dedigovovaradi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=math+worksheets+for+grade+4+division+word+problemsPDF 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_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 11400 bytes
SHA-256: c07d89a744f1a87bd24a96d093591a6f51de188c721d3b8707d566eae25e63bd
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 17364 bytes
SHA-256: e9478e6859ffcc34b1d957ebd95226977581a3f5bf1974f47555dad2e53e9f07

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