Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bce64d586407421…

MALICIOUS

PDF

78.0 KB Created: 2021-08-18 22:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec779b4673c91a43faa061a3490b9036 SHA-1: 69a72f1d044df302038c5e182450d932a5af055d SHA-256: 7bce64d5864074211ee82fafeeb0396599d44c517a7acabaa6f6ed40cf22f678
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous URLs, many hosted on compromised websites or disposable domains, designed to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this phishing-like lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://safarang.com/basefile/files/40275187893.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a594a0db69e---39787278851.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/29015193919.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/40524687198.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/moxisezuzonugajubi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c08cb3af---84661437656.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/50891885807.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/36143828483.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/43742062092.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160871a72e514b---44010603009.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/79308352357.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/71730498486.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e5ce10d8---98543952707.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0a9c9b30---20545072371.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/riwarosej.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3de1maqs84bjr05beu3165l3jg/96587735432.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6d46e63ac4b9b2367698107120b726f3/lavawumizukusisefunog.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sitebuwopozasusiteven.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3015dbb4---69943010956.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ou31pitv57hfp2u54rm4pi5472/zagapironuvo.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/pipifedirewelamaf.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/22975498012.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/186f90336f494356ce414ecd24194b14/33209185797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+steps+for+irs+refundPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 10644 bytes
SHA-256: 5c2ea390676339d75bb4898b7394db58761a9dd2d59b0e3570af11b0dc014778
font_01_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 16900 bytes
SHA-256: c8bcb2dc4e6e3c46486b31d869f84e13a43f67440fb1a447059345b2d49ddb66

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