Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9530121df6db31…

MALICIOUS

PDF

72.2 KB Created: 2021-05-25 01:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 03eb60821ca41e41e0aad29a1309c3fb SHA-1: c135879526e8f3d4a4cbf74d9f3cc46f1d7fbb6c SHA-256: fb9530121df6db3185bf18ca550a4a5ee7f29e02e6795596490bcc62407eb9a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to an internship report.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/vr8c0694tv7pesftlnsrh41uc1/fefutof.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742793a86fb---79159186686.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/8294266255.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53604173727.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/3676835665.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cd596de01eil6tcfh64p4jmeqm/58802945157.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/77953473616.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/82408417874.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xugubon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e42b9ecf8---kikoxar.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sisoxejatipekakezidepo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd183bf2b3---fipupopemiwavam.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/6ac8e05aabe4f6a7dc541a19f6e03da7/katobiginaresu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/193f0492e58a6aff3161fc5609824a39/nitama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rapport+de+stage+immobilier+3emePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5592 bytes
SHA-256: 824a0ce0313d591bf8b665565b68f53f1419b0a4a22fe3a2a9356d4038a17600
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 11536 bytes
SHA-256: 9f0cea9f0e9730e99c1924e1d36a640b6f0711f63c66135943066060d827ec43

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