Malicious PDF — malware analysis report

Static analysis result for SHA-256 759fb87a4688025d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 20:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03ee2c41a4823a38f3b5e15abc068b3c SHA-1: 7b3c946716232a401a9ae3b8f272c5a4fb4f669a SHA-256: 759fb87a4688025dfb085df4011d378a079954b76aaf228ba6ac11f92ef13086
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple URLs hosted on potentially compromised CMS platforms, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tentimesneedlehill.com/UPFILE/userfiles/files/wemiroromewulazol.pdf In PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/vobizofetu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/97678261809.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sekuvavas.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/60374357754.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lr200ph9eksnbvcdk08ttg90j5/dazujuzinimodasezabufowaj.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/8045768387.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/gizogurozikewanaz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b63282af0---voxugofutagojebi.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tabikisovofep.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/dojos.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/limuwaxuxegozarakewa.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/wekinukilezaloz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078722e0ad25---62068840215.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe57fc5f586---mevujusopanamukezufave.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/db40ebc9f64d0108d44cd2848c4d42d7/nugenilovuzamidafow.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e30593dc6cf2e3a2fd626b07b0430721/92381688031.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///10939015733.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/vigivamisade.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/909f7461e9c0fe540583c6870803f2a4/lemozoruxugulu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969d6937c6---24478480457.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/54195899609.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210829075901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=honeywell+1300g+scanner+user+manualPDF 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
stream_005_off00011cd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CD3 18848 bytes
SHA-256: 445736faaac3ec82f768616d4d101baeda2202d8e7727d6793491421eacbe915
font_00_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 11020 bytes
SHA-256: 82deeda354f375e123b257e4a0734117b0cab5a4867ab2dbc7ea3878881510cd

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