Malicious PDF — malware analysis report

Static analysis result for SHA-256 7125aceda3c0cfdf…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 03:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3a490a4584f7d704ff1cb0e3027a90 SHA-1: c9f9d6da823ca4c663d1723263b305b49ee54816 SHA-256: 7125aceda3c0cfdfc34bef9dee027519015be5fffef6db29dc59b9b96507cc0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/drs9kj5o678qcnfguc5q66926s/tivizonufixomone.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2d2b3089ed4b0176daf102a8d319e18a/noraz.pdf
    • http://quadocdao.vn/uploads/files/96930702051.pdf
    • https://badrivishal.com/media/77234207937.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c18e09cd7---31758390953.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c63871b8---tefufe.pdf
    • https://hbphoto.ca/resimler/files/ziziru.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd197eb47f---91257897638.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/380e621de0d18d149a97d50b03e113a0/binejiwituwafo.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jusosumifino.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/gisom.pdf
    • https://aulacvn.com/upload/fck/file/nixusute.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609329e93461e---85006376513.pdf
    • http://kaies.cn/upfiles/file/padifotunevogi.pdf
    • http://automsystem.com/UploadFile/file/20210625051741790.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6eada24de0706edbc746f6537b9a4817/96767795602.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e13143916---76089151299.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a15919c5e40c9d345a55dba7cc42a161/velusibivekomibupoliwujem.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa6d7f997---niwusomatujixana.pdf
    • http://greece-ex.com/images/blog//file/82463758741.pdf
    • http://kaitosushisb.com/uploads/files/74498136752.pdf
    • http://vencedor.coop/images/admin/file/74412672579.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+development+pdf+tutorial
    • 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_off0000f23e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
font_01_sfnt_off00010a50.bin
6720280b70d040e3085511e79a302dc5c9a386c61a21f075c648e829e6843567
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 17808 bytes
font_02_sfnt_off00013970.bin
fb3b60a5ea8f97a31c52e1f563934082ed33b959d3e6011e021eaf4d8e0658d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 10636 bytes