Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc4f213cf8d02a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 02:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c85d873eccbb41988d12ffc88abc4193 SHA-1: ca49a49252346411a5497129dd75420c239cb9e9 SHA-256: 43dc4f213cf8d02a22ee8ea41fd0155da9f410cf984536bcf79abefcadb490ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://weddingitaly.jp/images/file/gimevosijofig.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd8dcc13d4e0b7fd37bdc74e4155566b/8324057779.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/84834972447.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a05d9d0e---94408307847.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bef40f06a---71746657520.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/buwilun.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22896d67d---68310006907.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/64883583584.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/dagurutorunajapaduvi.pdfIn PDF document text
    • https://ikansambel.com/contents//files/54708849769.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42d7c8c4b---sukegokogogibazitedifaj.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/81069146912.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/59274acf6f8e10439c3a4db361c929c9/pizov.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7a45a9g91hqdfqj1u1gid8j9h4/tivakisike.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oqfqov0dm8uif4rigt7a1qvls4/xolijizik.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/94417352188.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tugizidiguliwuba.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160eff59cb9038---fafarotozinodo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4248754c5---70672540015.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16255422374658.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd85d1b68---vexewaf.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/57927580679.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/47324888000.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd890b522---73271080085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=brexit+stockpiling+2020PDF 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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10876 bytes
SHA-256: 67e9bcf39f949c6c332badad68be66ddf4c40b382d1b2cdf54be5d4d6ed7c4bd
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 18652 bytes
SHA-256: 185014dbe96a1c96d4a00fae9150b5903e396570b335415ff0e8d9de699e1486
font_02_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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