Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eab4279e2cd9b80…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ca5dc162ea18438df43fd93fe55ceee SHA-1: 1250dd65725f97533309b13588acecac92dde610 SHA-256: 9eab4279e2cd9b8021dac5142f5b6609d9ea0d8c94267d67b9aa92a3fbd54823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://playindiano1.in/ckfinder/userfiles/files/46180064650.pdf In PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/66660455987.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/79110137378.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139fcbf3fe---71250797586.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/87045890886.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/roxejajakil.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/pumufagam.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/supepikiluxivipobon.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/vopisexilujodumojaxan.pdfIn PDF document text
    • http://tzsunup.com/upload/tozasavibesefilezovamo.pdfIn PDF document text
    • https://bloomeng.com/uploads/wovezisasavonuw.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/pawoduvuw.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612f351a56ba4---potifasadagofugizexovez.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/18177822627.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0755ae4b4ed58bd93b894e1357fcb26e/dolesunanutan.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/82519105236.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9631a3e809f01f29549c9809156320b/webupoxexasowalijodeviz.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/75399328190.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80760079125.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/rubima.pdfIn PDF document text
    • https://limadelimon.com/images/file/406703222.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/52174366446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+screen+recorder+for+mobile+gamesPDF 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17484 bytes
SHA-256: 7ac429a80534ead8eef9b00fdeddf400cac238ff39ac4619fb1fd3d593969c76
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 11012 bytes
SHA-256: 03cbd0305f2c8e4f65dfc0408932a55a9aa0e7b93f66cd8638bbc21c03f24a67
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1