Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43bd4a68ea950d3…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 06:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5e12fe77587f8a6f29b805bd0686838 SHA-1: 1ff9008ffbd4669ff0c59a46209c93e4c1aa491b SHA-256: f43bd4a68ea950d354c783fd23f650c34617da3de0113b993385e21ef9d78159
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm or redirection mechanism to facilitate phishing or malware delivery. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a7170b51e5c44406f58ccf5ed40ffee4/xiduz.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1ae0052943af9e461b9427d08dd2683f/40925010132.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c3964d43a7c456be4ddc5c3182fbf40d/97493785386.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/30717195484.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2da7ec30---74370373162.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021721248865.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65cc148f8---pexodajilonisolizax.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wifamutironagenagunek.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608906fc378bc---81849110098.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/6939181022.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/96506981675.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/kulakise.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sj9b9a9hvr2gp6hmdqoi0fb2fs/88593893900.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1a0b8116dd00cb9b9c745702e9da2822/99646228269.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb8993d3d---17857492179.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8f7102f2---favalo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250702efb4---xevit.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b3b57a81---letefok.pdfIn PDF document text
    • http://usmleworkout.com/files/file/31426092548.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/49243884144.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/soted.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/1200056371.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n9vr0fpnu1tr85mp19c5tnb9oo/tolejeremegawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hymen+not+intactPDF 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_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 18128 bytes
SHA-256: 8eca6ddf736ebb64321e2e27e1dfac1534ec9552f8eab72955f6685cafe2c7f3
font_01_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 10184 bytes
SHA-256: f48306bc58f4f80141333c86e614d7e703c021e0e124a07bf20157893e31ec09
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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