Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ea6d4fc337e43a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 17:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1776d636ace8332707801d5c3ec0797 SHA-1: 38e32a5631620e030e8e3d342a1816ff60e04e54 SHA-256: b9ea6d4fc337e43aff14aa9730b22dc480268707a35c4173c76334f39b47165a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://t-p-fortune.com/userfiles/file/gosaziku.pdf In PDF document text
    • https://carparts-fixture.com/file/file/85809964229.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d490160bb---dipoxuzedopeluxuxunibe.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sidoromi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9dfol08515mvh5cbu7fhs6rfh6/kezigesi.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/18552857186.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073fd3cf388c---wabujixijebuvopi.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/70465349180.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a95949285---62863645167.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/wivofazin.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86da1379ea---zidazok.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/xuraneninesi.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/97613134730.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/xavenofovixupomajudakin.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba602eb6beb---27925568721.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6d0efeae---pibemagu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e18f4229---lozurekoxujovazogakiris.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07674714a9---67794142668.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/26130482005.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/96361501879.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4adf42af57cbff24fda788c41587b659/beloxuxibigikafadig.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/latejitutat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=an+outpost+of+progress+italiano+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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10752 bytes
SHA-256: 3104b653eb85c54e26670e59beff650203c169e7358968c5f64c34ee38dc4cf7
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 18332 bytes
SHA-256: f95e3b23d5458001e82449c8d26ff5c587c50055e6396d381f399cf02f4b5fce
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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