Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3e3de87e95b121…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 18:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4172473239ea917a36acafdcddaef5d6 SHA-1: f19e8e2f86613eb42b8444c74b1a3123d511aeda SHA-256: 5f3e3de87e95b121f30520f91b4eb18ff6b09d58fb0fb2114606f02878a9a61a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nexxosrealty.com/userfiles/files/31524838350.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5851be20ad---82753905290.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725045a1438---zexulexuwovewarezap.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/94306694312.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/750884abf1916b78ab9ab36383847cbc/petokowip.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/retowomijemalaki.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/5974797960.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/44768840596.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/munakogikes.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210701_DE77C15CCD8BFC14.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ejj3j81o11af2d8h58oq2ba29u/77980796901.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/52169209068.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/74485246072.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb5035789---wiwixafazibefo.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8f6406344479c0daacbf5f6024e546a1/36592520573.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd63f024e9---10544487424.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/72542958398.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c92071d---79877970844.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/nataxiputerora.pdfIn PDF document text
    • http://groupkaishan.com/d/files/sozebapoxowiwisosowute.pdfIn PDF document text
    • http://www.bash.cl/media/file/86510837962.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/56303080239.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/17399532452.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sizotinewimaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bilanz+aufbau+pdfPDF 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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 10224 bytes
SHA-256: 9cc33e8552f2438a9ec1705d5a6af702bb7597f7c465804e0d7c27984bbf5318
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 18784 bytes
SHA-256: 908eacfdae1b57c764ac71f58a819d9fb2828fade71a41b9d8f04724e1ead764
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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