Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93b9de62712dc3e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 21:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6552cfc9a1ed923bebc6984e1dd3111d SHA-1: edc27ed2170a8c74adf5aaae8dc2e05a338ad88d SHA-256: f93b9de62712dc3e71ef51ba5d56a646728f3958a8cd9ca3f803837d65822416
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xiwololokon.pdf In PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/92692794163.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fodaditazevuruzajijarolas.pdfIn PDF document text
    • https://filetorme.com/upload/files/migazufo.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/72440985914.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/66695226761.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sirafasexivirijeg.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/muforimibunugefelovoxab.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/52185454271.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8bf8eecbb02d06919e2d3d97a6d1c7d1/49167885752.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/80229299258.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/rapiputusivanitapipubew.pdfIn PDF document text
    • https://mavibusiness.it/file/53333629050.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/87111042384.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/lapirad.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/vewakelozasiw.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6178928572.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d929d290---buxagofujuwatefa.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nesusifix.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/minipezufixa.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/moxexudotam.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2efb26215---78615771544.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/xepisajezurene.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/pikijilegegol.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/6346667045.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kipivasilosukijura.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/86851654173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ipad+a1337+price+in+pakistanPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 10656 bytes
SHA-256: ed3a87c560b7a4b37e8642c38de84402124f6e239accbb8ad002091f6ae03c4c
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17652 bytes
SHA-256: 0e8e3bd401a61f5749f9243773c810134da587900af893150a624e2bfcf57284
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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