Malicious PDF — malware analysis report

Static analysis result for SHA-256 759a660823f80be1…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 09:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d816d011c96d51176fadf15e9048c9b SHA-1: 6f81f736556679d96b254855bf89b93c2ab1d934 SHA-256: 759a660823f80be18e922b90d97020aef272493ed877d100c9461d5879425963
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://pytextiles.com/userfiles/file/29889223800.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/lojatij.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jubegomawa.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozoxetotok.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/6799745802.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/79752910447.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18e9035e2---larijanitemewazit.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/xosubofilopivadabor.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8fe3bdf07d9979f1fcf3c1fcb6dc55f0/98592543297.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed4f319f---winuzegogarak.pdfIn PDF document text
    • https://network-italia.it/file/gogov.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pqri1if69cdq11qsq3v4d9v013/lodanuv.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83930158549.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bae2b5d5d---67093120680.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/31410078845.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/78306361619.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/nakesufarokusekuripeve.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xidugufojedale.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/wizufukikegozewakigeg.pdfIn PDF document text
    • https://majubesar.info/contents//files/ravisixolaliveveludidezat.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nuwogakirulaxikuf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f8d3e6321.pdfIn PDF document text
    • https://ckmandarin.com/uploads/medekit.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944f460cf18---pedovereluvig.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/30803932089.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/jiwilasuvemajov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=esc+pericardial+guidelinesPDF 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 10552 bytes
SHA-256: f5a9b32fd2c8d4cf19fc75a1a6491b6e69feb1c5b54501a2a2138fa019635d0b
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 18548 bytes
SHA-256: afaf918c0cde65cdb289b69952d2b8d152132c6c805cbee60bc1ca5a040bfd46
font_02_sfnt_off0001426e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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