Malicious PDF — malware analysis report

Static analysis result for SHA-256 987de7d1c81d6583…

MALICIOUS

PDF

92.3 KB Created: 2021-10-15 16:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93174b111da02383a34d269b4f68e645 SHA-1: c33c911d0e14d98c8357c28bc5d01b2d5e3a9abb SHA-256: 987de7d1c81d6583a6edac418255ddcec52f39d82bb69f6813ff045d4474f681
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=how+can+i+watch+the+canelo+fight+tonight+for+free PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/dbbbd553d006ec141f0bee206207b198/xokopimulasi.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/masimosidibifav.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/luxutezudum.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/fofosuzepisegiluxi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/nepixifobarikep.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/26504778944.pdfIn PDF document text
    • http://husplaza.hu/editor_up/61086210632.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/6228195031.pdfIn PDF document text
    • http://bastola.org/userfiles/file/1656074020.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/65707009028.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/zufoga.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/funoxagaj.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/gukeleg.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dkgc4dfhflnf5acfoopgen222b/29246461056.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/3127468094.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/88893459392.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/79bfe0800f5c317505eb69c053de3446/84913560427.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/gagozuto.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/91455911174.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20211008/16336266427732.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/69805712242.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/fugobelobevulexilenewemab.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcf02a4632---pivaka.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/situmodagowal.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8nvoond5i2odh4h27r2bcja5pc/9507926556.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16161049361968---xozigagubilawagizexiti.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_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 19756 bytes
SHA-256: 0df57a2ec21793555210d0d353fab63219b1f95dd01e9f7b2d183e79cfd67f09
font_01_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE0 10524 bytes
SHA-256: 09b3038464413e6aebac2c7ac2f90d6b28b0cfdd75bed47566258f13fdb11c6a