Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0e9203379a7e74…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 14c0e7372bc263af49919264b31e05f1 SHA-1: 18d50d53856d5a80ad992d48f8bbcaabb7330d5f SHA-256: df0e9203379a7e74a949fbdc05fecdc2756617b05e18151a4e2b4a53d56f7e61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm. The embedded JavaScript likely facilitates the redirection to external URLs, which are hosted on various domains, some of which appear to be compromised. These links are designed to lure users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c952b978---renifuxinawus.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0243f012c0---rujugawolikibijo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/kitivibag.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/60989807147.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16222449726557.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/92784109771.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa53a63b9---dakevuwar.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa788d07b6b---70179199320.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/neduvewuvepilizonogovuwaw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071740377f44---zipawawakoluwobejizilupa.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jixazuxu.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/36848653072.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbed23879b---37967231976.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/siferumodamigosas.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qod04vldd0nee0d254otn18on1/31955876698.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bddb2d7f492a5a9425ec09298754fd18/zipesoxazeronobipi.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/4600426788.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/vomevemezetokakomarelinu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/97156422296.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gotumefitigunetojutawufo.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/zilafurik.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3e947e14c3afb6b26fbae69b4ef9d0f1/63487395398.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c955d3498---57157692157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=airlines+allowing+emotional+support+animalsPDF 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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 10760 bytes
SHA-256: d4313072475bb61eb51ca136d322ab2fc00847a283fd4e044af978dfefdf33fd
font_01_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 16756 bytes
SHA-256: aa43d251aa770595eb74b737142695a6a22c9d579d651fc46a1212e9bd983999
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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