Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1dfa7263d01ca4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 09:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db261880c0fcb7a63d1cc7ff90ca9eb9 SHA-1: 58a61a7c2679116f116166af9b08c756ffe4ff1c SHA-256: db1dfa7263d01ca4ab3b44933a340ad595d4e3d63ef8eba9a7445901b16882fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or to download further payloads. The presence of embedded JavaScript points to T1059.007, and the nature of the document suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=como+desactivar+el+almacenamiento+usb+en+android PDF link annotation
    • http://megalabsrl.it/userfiles/files/sagina.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gupivememibuxupofabigisab.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/91034270442.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44975699399.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/33132459601.pdfIn PDF document text
    • https://hkki.org/userfiles/files/jolofogeberazoba.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/28778832244.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/68295299072.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34717556642.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021913191455.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/9587228817.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/16480672781.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29b4bbd60---nikivaxewokukoketulotaj.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • https://electroagro.es/pub/files/pijazukopoloxadirenumiz.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/siduzazojofowuzejur.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/46841504953.pdfIn PDF document text
    • http://vhshf.de/File/vifibovesemume.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cf74b0ac12117a52e3715318bcaa9be5/pawer.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/61266613219.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/merupoxasejezo.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210918/16319489303195.pdfIn PDF document text
    • 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 10868 bytes
SHA-256: 4d140d8332949a8fa75f59f0fae1d1ed82e13bff3493038c511d46bb784c59e7
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 18688 bytes
SHA-256: 0f1ff9a107df11284464887f1db0c312ada4310a86cc190cfc57852ad1ee41f4
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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