Malicious PDF — malware analysis report

Static analysis result for SHA-256 258242aaedaf9fa6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 11:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32496d618855fc0df8b13a8b039b871a SHA-1: 67586b040998f7b1d7fcfcca8179a7a62f144f3e SHA-256: 258242aaedaf9fa6c6f45f33d9a6a39853266e554a4ceafffd0acef434ed16c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://koronowskasm.pl/file/61156618736.pdf In PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/ralobukome.pdfIn PDF document text
    • http://iworking.vn/uploads/files/fumafenoxo.pdfIn PDF document text
    • http://wohntraumgmbh.at/wililofefuxo.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/texomolalaxel.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fbb964974e49cf081fd1c654704c8a15/53638138100.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/kusepesod.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/7328452976.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wuxabeguvorugofi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d026fe451a---50759837957.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/09d4333c19d331f51779f074bf40da0c/bajatinekuromuwix.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1611a50521911e---7261967745.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/kujitip.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/28801755294.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e87cb21864a0b50f1c8b6de0ac184ee1/84774423274.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/sesibog.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pidemabenibeso.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c454db2d1a5---goterake.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec3433e8---viwizoluligijuzaxabitijo.pdfIn PDF document text
    • http://azizolace.cz/images/file/numupetijokajafakuwon.pdfIn PDF document text
    • http://vejwun.cz/images/povawegozizubolut.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/maxorag.pdfIn PDF document text
    • http://cortabellanews.com/userimages/sejibewani.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/mopevubipatazezuburafuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=agnello+di+dio+testo+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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 19924 bytes
SHA-256: 0f29afb41edb1311f2068bdab3a50abdb28511150aaebe7cc4596a7b4dbdb36c
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 10392 bytes
SHA-256: 86d8cd89e1779bb85096c6f5c8ea99ac3b64fa6ba818c0d6b4aa51fa225d39f1

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