Malicious PDF — malware analysis report

Static analysis result for SHA-256 af20fb5d185babd1…

MALICIOUS

PDF

98.8 KB Created: 2021-09-20 17:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac685aacb2a7535d5d4aafdee33aeac9 SHA-1: 7ac4e784e2bdc2537a6b152e406c40e8964f17f5 SHA-256: af20fb5d185babd1105542225dd0b905ce5490380c01538d55efb523fb565f4f
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 linked to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing by luring users with an ebook download to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://catamma.ru/uplcv?utm_term=taking+charge+of+your+fertility+ebook+free+download PDF link annotation
    • https://elemental-ia.com/userfiles/file/pavikatafinulu.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/8702160574.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066522e7ee---26615913494.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/35898863769.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/68144211749.pdfIn PDF document text
    • http://kesifveotesi.com/files/58260736842.pdfIn PDF document text
    • https://777mto.org/contents/files/wikej.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/94730063841.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/33018925076.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/95924594095.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/geponelanebosaj.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23859758993.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30116440416.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bozumatebakoxe.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/xumutuforefogulezam.pdfIn PDF document text
    • http://bdsductri.com/upload/files/32978191653.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/pujerinosukezisefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398c3e868---vinizegolif.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kasavokopukedukoruveba.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/42759250209.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/472675570.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/21916528360.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-09/images/files/jopavogovelejaj.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/lirilujem.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38689103174.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba5b2f2e---zugiwewuxedesivofaxum.pdfIn PDF document text
    • http://df-2.de/images/daten/file/66819912141.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_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 19132 bytes
SHA-256: a80d6483af1d82c86563632a410be9e9472d09b26bad9880cd7699c14029643e
font_02_sfnt_off00016343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16343 11080 bytes
SHA-256: e1a4db486ea2dc66ad31684b152af35f22e382e0ce0e25d5a6a022d04f3f86ad