Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3a9d37dd9c6505…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 14:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf3030259ee9b9709e757d7a1e186647 SHA-1: 4322779008b55b73f59923a36e3bc21376b9bb43 SHA-256: 9f3a9d37dd9c650589770a6c7d472bd5ee69d9724d100349c058012449789cb0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the document's purpose is to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://sambelteri.com/contents//files/zedigapanoxuzisoja.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/36526805622.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6caa669bd56c7d8342f51fe9be81540/54866383024.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u27vrpkm3krlknpl1hshn8prpi/bizatadimugodasamasunofo.pdf
    • https://fajndoktor.cz/images/file/files/liwojusilunipe.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/cpc47po8beqc1klb0jj2b3foro/gavijag.pdf
    • https://eletmodguru.hu/files/files/51518582881.pdf
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/74082957729.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e6402c44d8138426e72672318102181f/futazivazaramilivumudun.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbedfcfbb8---69020923943.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e0e4a3e5cdddb29b162c6efb4d79a811/29828122594.pdf
    • http://chronocertif.com/userfiles/file/87565142393.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/63944688426.pdf
    • https://santechnikosdarbai.lt/images/files/rawukojivipebemobaninimo.pdf
    • http://www.pattyn360.com/upload/forum/files/50936101319.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/kukulumojow.pdf
    • https://actorconseil.com/files/file/94108265884.pdf
    • https://nepalonetours.com/userfiles/files/51824390763.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b833ce830---pipuzalepazuru.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a69a7901---50940607632.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=latin+terms+used+in+law+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 16792 bytes
font_01_sfnt_off0000e6b1.bin
3b77c39a93f949a89f5c700b0a7f0f8d8f4b727841ffb6a4c1ddef93a996a5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 17088 bytes
font_02_sfnt_off00011226.bin
f4bfa229d941961852709d3a8a6fb34a19580c2ce14431e3b1765a8eb1c9638f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 10680 bytes