Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ffb74eaa4e9e77…

MALICIOUS

PDF

104.8 KB Created: 2021-09-07 18:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8c82ec5ca43f9244834977502bcce6a SHA-1: af36059b07d91588e26a761aaa387083f60b7ffb SHA-256: 53ffb74eaa4e9e77d990de1d1186ed423fad0ed3c08dfc568d7a8ae8d7bbfbcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also links to multiple compromised websites, including WordPress upload directories, suggesting it is part of a larger campaign to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hq1fepv1hhcfp8rqtp771224o/72935768368.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nibure.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161001c5f6fb62---jidubaxumisisizuka.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0999782e455d6b63837c0d947f04f06b/zekezatumi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/64916432974.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/65948195153.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/6344841763.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/16859588796.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18617905626.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e14fd396a---lotubuvi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/100d5a96b4bc365ea7a4d1708e7e55b0/xetunobakonopodudoxulemi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vizaroromodam.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ien0s3pmje80nlmn406lers1p6/29999273641.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/18082166254.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/23447216918.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021623161194006.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qktofvho0aop3ub9b942upsis2/silewematuvosotijade.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/3274713455.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/96088908954.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/78983316726.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766259cc69c---gewojumasivi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df93654bca---fibakob.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/82c0fc10d439a3255a38d2209d55a2c2/melofusesoruwatuwefimo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f5cjhfmo76rsh318o8ec4radlh/33548675759.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/27754564358.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46e39d3b0---43669648808.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/dunilokutusavuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ge+dinamap+v100+user+manualPDF 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_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1F 10712 bytes
SHA-256: 06b43b4417329c4045803416f01137bd149f0f5895b1ec2a0ae927d70d296a74
font_02_sfnt_off000167b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B2 17392 bytes
SHA-256: 32b8b1f8521a58a85455987aa1f26a3bf9946db5b26a4aa7c6f10f70610db2dc

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