Malicious PDF — malware analysis report

Static analysis result for SHA-256 9411049694f4e613…

MALICIOUS

PDF

81.8 KB Created: 2021-08-27 22:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d3ed5c764d8c2feb1a2d30e3ee1d7395 SHA-1: 1fd4687ad3fc6107270f96518154597057124bbf SHA-256: 9411049694f4e613bc8649eb62a3c47e2a7753a07b1dc176d8197a3e9f6c95be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611d391838172---movizumuzewetiwiv.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6af277f7---8976984491.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6ed13360bd4fb75dfbb453eafa3ba708/99890799166.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sujaxupabodotakunawim.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/madonal.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/zisavosekif.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/31586605879.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8e24d9c6c98758f12d967127df1ca315/xemadoku.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0vq1t8o69tifpc9bkgq7lui491/dolurajufikami.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zafasuvopezowanoje.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210821_DF039CAE1FA8018E.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/91617820133.pdfIn PDF document text
    • https://razredna-nastava.net/files/53583478768.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e94791b79b---ridolivilutaguxitubukol.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4fba5114---kexevugakofurufuna.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/27187574499.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/vadogemisimejexaxa.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/56574593486.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/kikipeku.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef150cda8---sevatiteridekogab.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16123848228a45---sarasekebaxiwubunuraw.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/polimusuvubeb.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/34945933318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=johann+wolfgang+von+goethe+maxims+and+reflectionsPDF 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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 11168 bytes
SHA-256: d09a0ab0db29b95814e58e4134fba6f2f3761fbc07593b40884cc5ecf36e185d
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 17984 bytes
SHA-256: 3a7d036fe7c68c25b01d70fc51ced457e8a020b9a207c18fc03c134a76bc118c
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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