Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bec1c242a85f11…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 08:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d1da7f26a567bc18eb422bf3e60265d SHA-1: 28fd19cf1acd40369ad3425fe2d9178b177915e2 SHA-256: a5bec1c242a85f11734739bcb6dd4e69e3ddb96f01b2659a54e97307e4ee1bb0
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

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://valserve.in/web/k/main_admin/ckfinder/userfiles/files/welijujulevepoxiw.pdf In PDF document text
    • http://phantasos.org/userfiles/file/ripapejitenepaxif.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/46089428102.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/nogavofomaketedoxuxut.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/af01a0f617f443ebb41f0885cb90cd93/tixenuvaluxewanix.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d700c95---25025897912.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/78928643287.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607719b4d40d4---poxelugagezedenenorekilas.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/12271320170.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c08ba9f43---xofotinasibelubifi.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/vakijuro.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210731024157.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ll80rsfpko5uvbt9kvhaj3c6ou/xuxuvenuvedumize.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf23aecc8e---4375637600.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17f64168f---15968752416.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/41482076795.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/36584093307.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7e74acf6---pegadofuximumeminojum.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ib1j9hd0ohqrensvl69te8b47i/ranipakudulakuvewol.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/65445556509.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/cb7aa410276fffbfd350a94d955465cc/pofafofexumotabuvujit.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/jasuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chemistry+important+questions+class+12+state+board+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b74314ae---ragujozofuwetalasude.pdfIn PDF document text
    • 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_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 18740 bytes
SHA-256: 2e42ac02f80296d8cad4896471c41108dcd2577f06c380ecdf99f6ee9d60ea5c
font_01_sfnt_off00013771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 11588 bytes
SHA-256: 0996cac4f8883f0749661a84af835cdc5808e5dddb3c9e2df05f43db037020de

Open this report in the interactive analyzer, or submit your own file for analysis.