Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88df0b2a8f3ff03…

MALICIOUS

PDF

77.5 KB Created: 2021-07-30 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23ca9dc5f175e56b20cfd3d6708f9d7b SHA-1: a28afc9d132c219fec333075c3631aaf29b07a9c SHA-256: d88df0b2a8f3ff032ef48842a78827e4ebd0a6d4cdd93fc3dd70e9ba3bb6a9b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites and other disposable hosting. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection, suggesting an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608741ffdfde3---kozodiwekutetikopobipaja.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd3459bc4---mekekujoribibevuretuni.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ddcb395c8f5ec70ff72e3486c00c34c3/vexof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38e4d95a62---zikemute.pdfIn PDF document text
    • https://bloomeng.com/uploads/91340159888.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/92089402065.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/772df56f678d769065dc143f874b0a89/99622152606.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/4383413415.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gizugiz.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/woxajasar.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ca9eab74bc9ffcb9e50f880d9e30afb8/18381636088.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/48376021560.pdfIn PDF document text
    • http://matras-devison.com/upload/file/8213201710.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/97634317553.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/oqvpa67lgo28kqt4tqdcqqk0kn/75429227962.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/16633973119.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/rubesiku.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fae10c6a---lawolamabujarasadilal.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vudodob.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/03rtskcgds25nm7tov9ot7mfj0/wereliborufetulujafal.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/vidovefenewejatisusomajo.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/jixulivudusazotarinapodag.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef5adbfca---54952059448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=creation+story+ks1+sequencing+picturesPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/velowudubasigu.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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 16356 bytes
SHA-256: dc24ca207c646a62598303d085dda128665a62edc3a4df9ae5cba647646d9245
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 11036 bytes
SHA-256: dc5d2f003beb32cb787ee5c6cd607c6e9d3ed346bf37b1c12b5710e8be0bc8a8

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