Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2847234dd5b0aeb…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 14:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb3afe3a4302dba6e5643449de72e5e4 SHA-1: 497c31ca81aced27d43886ff5a7176e4171821ed SHA-256: f2847234dd5b0aebf03fa382b9ea0ab9712059b8a7fcdd3ee15e287cd015ca37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting. These links form a link farm designed to redirect users to malicious PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://plasy.com/uploads/file/tefubirenakeb.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134011897244---kawitefafenubikok.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/mesojalagutoj.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/robat.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/wozoka.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/11992136031.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79383251d---lusunivukajabexidiwunivep.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/51137511694.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdf0f08ed3---lubobakijovigon.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/tajelajeravujiroxu.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/taneraduxuj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fce319c1eb---lodirejagiweja.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/12766218870.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lqmrkispbjqo0inascf8vblru3/medegavivaxezulunojezumi.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/90419697344.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/7560073588.pdfIn PDF document text
    • https://laser123.com/geektic/files/90753451210.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/zibobadoxivezakojotonamur.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/59014915661.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7c0823da---nixabasaxejiluguteguwe.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/74657038630.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zadopoziwikekibasigife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=retrieve+deleted+sms+androidPDF 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_off0000af03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF03 10520 bytes
SHA-256: 31d2f1dec61bcb4b55e292cef60ff8739c1fd158467f1e0a790417335cce6e61
font_01_sfnt_off0000c6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 14376 bytes
SHA-256: cde757f6fdda0daf4e3fb494da2703d70450c1d2218d3ad1aac1d1a4d37ff3b4

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