Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df6ffc4c8b586fd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 01:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aff52c341c0ab3b151f19b878782720 SHA-1: b5740a2d894cd8df996e526b0163688bdac50d08 SHA-256: 4df6ffc4c8b586fdcc13bd11944f4940b7534b172bd7a51f3b34720677002a33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://davaocarrental.com/images/file/92614601568.pdf In PDF document text
    • http://marisqueandopremios.com/campannas/file/92742879546.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/jedivipi.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/gituk.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/gifugedubureruxobo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/82e3df08d758527975ca079755c792b8/35848465972.pdfIn PDF document text
    • https://produse-zilan.ro/files/xevebibekoxobebasubudo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7e41025a---forapejujutanatexaw.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/susifuwomivamopuve.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/bemanemisixibixafivo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/roxupopopoxepagigude.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/9545959519.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/80712368627.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/84803155088.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0b11cac0---48033291525.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/gopofu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b853353f40---60558586729.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/pidegapukew.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/mesubitolusewilitusepud.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/wowumosek.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/jitisivozovabezositen.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210902180204_fxa8ob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fifa+data+obbPDF 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_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 9916 bytes
SHA-256: 861f2b41b41fd587b3a045ecbc0f0c7d6fc858d19d5743ed34abcae926992610
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 17788 bytes
SHA-256: 08a486a81a3f233940493b3cec8c00fae48165191522ab86261cbf57bbd2c0e1

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