Malicious PDF — malware analysis report

Static analysis result for SHA-256 163f61aeb66ab2ad…

MALICIOUS

PDF

97.6 KB Created: 2021-07-05 21:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 49e2257b07832736486d2be7a32ef1e6 SHA-1: 11103c19315be7a48ca84b2f4ccb1314bc7cadf7 SHA-256: 163f61aeb66ab2ad3ed6f7664f5acf9fef87b8f2853da3a490285d11cf00e645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b058a05ccde---4438635543.pdf In PDF document text
    • http://prosquash.by/data/begezatovoxawijowetop.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/fesupimiju.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/71860325216.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be918941d63---pubobutiwafojul.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/34010293024.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d8575974c7143b502163b4e1f863c046/budofodaku.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/b56cma9tllrbkcr8iogpvfq320/dejusitimavupijej.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/sefiraditeroma.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/bad31c945f22bf0ce42b1498e1beb426/41912444096.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/darevitefazitulevaneduj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/gotuvivibivozax.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ba821ebd---71296270301.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1432dae24---19293791371.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wabigatemakudofifumekazo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3cc741e3463b62dff598527fd6e5969/79720085867.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/u0n5pdb5gnu4lkcpjhkfo3psvt/worot.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd946564f3---muzofupobilirokikole.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/newinigemosubaki.pdfIn PDF document text
    • http://efrex.cz/files/file/wuwikinubokivilovil.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/10776047739.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/totiwewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=take+a+break+issue+15+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cb038e80eb6ee1ef6d8ceb281c725d9/6568497062.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_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 10404 bytes
SHA-256: 2dceaf8281636413af318c6fe9490a129f3b5cef8939cf6a9d493a1b02757dcc
font_02_sfnt_off00013ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCB 28196 bytes
SHA-256: 334a6d5be3affc656180760d07648500247bd982f5b82b74ddd9db6832e89571

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