Malicious PDF — malware analysis report

Static analysis result for SHA-256 4394769a2647d1ab…

MALICIOUS

PDF

81.1 KB Created: 2021-06-29 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0818976b5d33bc5ec8c5a99a2f1b27 SHA-1: b1f97db57fb8d3bd63335522b17808638d69a887 SHA-256: 4394769a2647d1abccf57c8dd3acd96886edcdd092606b40f09fa1612aac1d5b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests the document is designed to lead users to malicious content, likely for phishing or malware delivery.

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://school19-zav.ru/userfiles/file/34168604012.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c12496e1e5a---muvidor.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8mu21dumbrqe48tq5t8gngvi55/72231545187.pdf
    • http://mazdooradda.com/userfiles/file/99942208476.pdf
    • http://fw-simple.com/uploads/files/xapamudofizim.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6080884ba---71094538956.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/2b0dfad94b83d3653e35f4bf0f6b8d46/89673911722.pdf
    • http://popnmusic.fr/userfiles/file/xaravegugokip.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c211de0097e---66942821566.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ojvoj438ga5cj02o5i0b215klv/duzaja.pdf
    • http://ya-ke.cn/admin/upload/53826079011.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727cdd155ba---batafamekatavapejejemonol.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/49408574226.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160974e6834d8c---nalifil.pdf
    • http://usaoxin.com/userfiles/2021-6/file/tulasutokukizug.pdf
    • https://allcreaturesinc.com/files/files/94851613676.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a761a2f8694aff2fe194100c18573275/20288501845.pdf
    • https://chennothinterios.com/uploads/file/kisatav.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/bdiah33rund2v35c6skpo0bve1/58330781132.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/50232770487.pdf
    • http://chromoink.com/updates/file/63184058795.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9c522220---rijerugijilad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=questions+asked+in+manual+testing+interview
    • 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_off0000daa7.bin
71f1180ce03a68d03378b87dd4e5201fbfd2b762503b4f4689eea72b93c32859
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16576 bytes
font_01_sfnt_off0001059a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16792 bytes
font_02_sfnt_off00011db1.bin
df7877654e29afcef3b0c407f285d5c38b50a8e0d61e5d6fe32e0f4afe91486a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 10992 bytes