Malicious PDF — malware analysis report

Static analysis result for SHA-256 356a86475acea85e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 04:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49d522066a79822f7fbcd0bb2edb6327 SHA-1: 0447a87fd10fd1efd982875049f20cc24ca0670a SHA-256: 356a86475acea85ea2d47d67e68fb768e7366595c2753e2c5d544bc7962bb8e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mimarkamilozkartal.com/userfiles/files/28616551627.pdf In PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/53ece33312fc7061d84891e3b040cda3/61437327365.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/77bf333d03cb43528010322b214cc33c/tajisejedanitaninunenazij.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sefopijobokapi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/titabavamilup.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/ketajifefolo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/tiwuponawunalavave.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/pojisabejosimije.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/jozufalebalegosozuz.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/21320058164.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6876e3173---jatuwirapa.pdfIn PDF document text
    • http://njchemland.com/upload/files/80344862125.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/xupugifurim.pdfIn PDF document text
    • http://kahasat.cz/data/file/vifolodigitegume.pdfIn PDF document text
    • http://zxsolar.com/d/files/tifukileravovirowinobivef.pdfIn PDF document text
    • https://stauber.lt/images/files/bilukomubotomofomogoma.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/gakofexex.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a9cdd2084367a60faa1e5a16dc566563/faroxodevajudonilil.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zilewiv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd0117540---muveruvol.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608230f4f163a---girelubuxojuparuxot.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2925d5f9---2874439607.pdfIn PDF document text
    • http://hasyo.net/files/file/wapotiroxadifazuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mazda+3+2005+user+manual+pdfPDF 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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 11048 bytes
SHA-256: 3d5ceeefda6e642098d8ce4eef58b27d199bedcfae9beed9eaa08ce63fe6d6a7

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