Malicious PDF — malware analysis report

Static analysis result for SHA-256 a519e7ed2cf9bb6e…

MALICIOUS

PDF

99.3 KB Created: 2021-09-09 04:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2299b4031f491d68d239295cccac77a SHA-1: fb67383d78e141df8599cfe5664b7220732ad5c8 SHA-256: a519e7ed2cf9bb6ee156245626288113936e2004024424a58f9c3f9d48b4e3d5
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 link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://pixomot.ru/uplcv?utm_term=scott+pilgrim%27s+precious+little+life+pdf PDF link annotation
    • http://kosmonautika.ee/ckfinder/userfiles/files/zavibupibisat.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/latuwewezilujoj.pdfIn PDF document text
    • https://85097781.com/upload/files/87104220608.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/midipotedaziritotiwimejuj.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/toberisopixerisetaposizev.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d97655f759393178cdc3e3813579c12b/67945126213.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/77854265633.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/45082711923.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/moxilipixab.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/5099357698.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/35570234407.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43063999079.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909075506.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xasobodonomalorub.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04864ce1---gixuwak.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fakosoretep.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/46847434236.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6e0af172---zowimajozaxukade.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/butevisopaginonabif.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/62111902388.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219922479395.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/69810573326.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139380acfa8b---32644350542.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/72055452844.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/55rbioopi417r64la527rfifd0/pebenisojemutapug.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_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 10908 bytes
SHA-256: 188332259a84f4f3323ba091e2ca6f1a939a912530e3a0cf117f3ad2375237bd
font_02_sfnt_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 18944 bytes
SHA-256: 86775f24f97173788d1d65dbb4165a46ba96b922749eafb2a1557ab81456f27d

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