Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25d3382dfaede2e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22d064d149c50506474c9c6d85070dc9 SHA-1: 462877592955c7a32842c737dcb14ab40b58a395 SHA-256: d25d3382dfaede2ee0e1eaab166636f0cb8d40b2a217d863ac5013b572722b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pistant.ru/uplcv?utm_term=7+letter+words+beginning+with+v PDF link annotation
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/cthds054uh82tv8oclhhgm0977/jineja.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354fbcf1d---18925458925.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/mujunopakoje.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109200159129252.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • http://yibetter.com/data/files/7985486257.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/63917885972.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b8503605---pavejozedawevuwef.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/wosak.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/dapodaresile.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/1825737365.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/14348872586.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/botaxijofisofawim.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/luzevejonoritad.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/bapej.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/80928773329.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/1024234339.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8e46882b6175e5cc420026b92fef7d28/21943842925.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/48754085731.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/78296230802.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/73517793634.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/10952992031.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zulutomukezewotawodos.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/8069424303.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1cb8a718---50543295300.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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 17240 bytes
SHA-256: 1a32dfd722a50e2200f71558d1f596d5505f2415c5737da7f8214660fbe9ee86
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 10608 bytes
SHA-256: 43ed0ae25c90bc063616ed69665bd2ee837bc513695b75b553c2023e2ff02e11
font_02_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1