Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95946c03986ecdb…

MALICIOUS

PDF

63.8 KB Created: 2021-06-21 02:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6389aafa547db2dafad2fcd388fde1c0 SHA-1: 9f8341d611c40645be0585668260ab36608d96ed SHA-256: c95946c03986ecdb0eb4255f462a5e23b26b848fd7209a7e586957f71f9687f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kuska1uo7pu1pf4q6jiko45uch/zatuwenitukel.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5569aafa193daf1dff2daa8cfca8a48/fabibavedalazu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/filijowusemovu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/lukededegosasiwobuzumu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/niritatexuzekenu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23ce2af3e5c180b30e1525c34a1ff603/dikitetupaxisujozajutet.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899857120a---tekivogolosasuguwitav.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/teelml3e2fqn7gmo3icnq0vp3d/mudetodiwuwepod.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/pipigelakebubivuvox.pdfIn PDF document text
    • http://esistore.be/userfiles/file/55279557071.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c7f13cda08f616f6ca6e02622a0fce67/zilesixanexavovetigujo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710f78d0759---rowixotegurelixipive.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096995452099---31663399434.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a13162c4b704ed7c82f4300e62cf7ec3/67552319765.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f6a86900a29046f7a9a9504ed8d1c6d2/13052567559.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbb76e01d---rekuxawemos.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210608084149_4g4chr.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b6326396.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/54v2vrsjnetajh6idbgpl86e4a/kanileritebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+unblocked+sweetPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 5196 bytes
SHA-256: ed55b3fb359d7323a52b2520e477ed15d4ababbfc7f93c07afc61d3dab9d9cf5
font_01_sfnt_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 9876 bytes
SHA-256: c63977a9896d784473358121e509f0461782a900a594c6eb5f9f883eaa3054ae
font_02_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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