Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9de3b4c49ce4e13…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc5694913fbb0604d93d7a37cd61bd52 SHA-1: 3a4b86fdf122a42bf4ad13f8fcc095e3a8b56671 SHA-256: d9de3b4c49ce4e138e599df00f9bbf2785419122260c53c5dcc2b55fb46a038e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's designed to lure users to these external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tasivn.com/upload/ck/files/34506620370.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a0d10cb10a65d5e9315ddc9041d3d9cd/talokujadivovegudeg.pdf
    • http://kashima.cc/userfiles/file/73054571569.pdf
    • https://arhometutor.com/userfiles/file/rerud.pdf
    • https://cncunse.com/d/files/83520475261.pdf
    • https://ctsgroups.asia/images/file/37023550346.pdf
    • http://tuyothuyluc.vn/webroot/img/files/57200225538.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/98241977095.pdf
    • http://www.terresdescaraibes.fr/file/gelelaxeze.pdf
    • https://kuzeyilac.com/resimler/files/22149032551.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/97847827746.pdf
    • https://mallncart.com/userfiles/files/pixawi.pdf
    • http://alt-1c.ru/userfiles/file/62190727647.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304d7d60ae9---3029730218.pdf
    • https://coil.hk/upload/files/64076349031.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/pomuluvija.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/86949534e26f46f13af311597d28db12/82973963193.pdf
    • http://dlastudenta.org/Upload/file/wajavar.pdf
    • http://jingkangchem.com/upload/files/9050571837.pdf
    • http://sabaispa.net/userfiles/file/84079431975.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=email+for+cv+sending
    • 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_off0000b7be.bin
fc67b13451d61f3fecd2796959269eec87fb4cb36928350d2d9fe42cb5f7d982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 10768 bytes
font_01_sfnt_off0000d048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 16792 bytes
font_02_sfnt_off0000e85a.bin
18cd0928bcc1d137a4d02675f63c7fc1fc5a1b589edc987e9627f04376c25967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 18432 bytes

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