Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e1a234ae384aa3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 11:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 423122ab61a7c8438dd1af2e9b0e38be SHA-1: 037212b4b6a7084ea501c2050a9b547f673cc532 SHA-256: c9e1a234ae384aa3c7664cccab3e972c5e26b162f4f7d7b36f871d3b4a1397e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://videofilm-tv.ru/content/File/wonevulebeliwajeb.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xisejodiwoxi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a784258f4c3d89df505dce0a4d228552/bibozo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/lawajikuzotuju.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/lamuz.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070312080a95---79825224186.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4737c29---gobulewujamujijusag.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/gavatigedazunofi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/sefudaxadokozesukazix.pdfIn PDF document text
    • http://staropolski.net/Upload/file/finizugavurugotabodibami.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/em54ol3l5ip4i0k4qatrgvm3i8/16892973136.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092d203bb409---31581211066.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/fozamolopi.pdfIn PDF document text
    • https://yuktogel.com/contents//files/rixisesuvuwugi.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/83649719837.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160830b9ca5267---kimusudide.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/34618427412.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/25596735978.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/16739597366.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021714656477724.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/91889278965.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5a7ff0506c7cb08c43b06d4c1e388a70/54311817099.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f0c8103ca727a40944ac962ab5d409f/686905476.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/46202109928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mountain+ranges+of+the+world+worksheetPDF 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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 10904 bytes
SHA-256: 570120fb1fcac77647ac0977f59048a346a6c2a034f6dbb36cc538cd4978c1ce
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 17604 bytes
SHA-256: 1f7d8ab799daa9fc32fdc76a4b21889f5925597aa10624680092a1daecaa38f1
font_02_sfnt_off0001307e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1