Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99bf1b091dce66d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 09:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bf86710385452ee116cc169f9f2f74b SHA-1: b5f87d671959ef3d8fcd3ceb6ff2b1f7caa8f604 SHA-256: f99bf1b091dce66de502438fd207b0ee86037f44616f55a4c6b68b071b663e5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm hosted on compromised or disposable domains, suggesting a phishing or redirection attack. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gz-theoutfit.com/UploadFiles/FCKeditor/20210903092423.pdf In PDF document text
    • http://kingsauto-bar.com/js/upload/files/magepojer.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/lazuzu.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/kopovejadakilijakabafekit.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135919fbb43f---kofusujirivofevixiweniful.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/mekixolevog.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/75099403691.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/54208007123.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/91234029286.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/93228031797.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/92604655124.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/28979779726.pdfIn PDF document text
    • https://congchung7.com/upload/file/28926891494.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161346c89afb95---vetefoked.pdfIn PDF document text
    • https://ambalatender.com/upload/files/2476160924.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6990f759---mukitovivowowenara.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/4411441098.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/puwubekosuwatowoxurided.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/64760674529.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/mikogezebirizamovosese.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_212136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+nfc+app+on+androidPDF 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 10532 bytes
SHA-256: d24e77e7d9b659f4a1eaa09bd6be4a39e96a6ebbb6a19a08e42e60ff756af2a2
font_01_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 18452 bytes
SHA-256: bbe9bfc28da1f7fb329f569068bf8a8dfa91cebd68da909b4d9e1a5ad36f6218

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