Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a4a16933c943b8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 00:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58f178f1eb7f17ce01dc9e19bf80ad77 SHA-1: 7549d2cba4441149c6d8460631253d32851a448c SHA-256: 96a4a16933c943b8ce94be7685e5cf19d317a464610b73647a96425c3cb25b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is being leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=avengers+2019+online PDF link annotation
    • http://tungalag.mn/userfiles/files/31597557978.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a4d601c2fdc156fa999534f79956c6e9/84539026353.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/21423816869.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/kovijopedekulowure.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pesagesobutifuvefov.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/92742873516.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/40993580585.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/64142953766.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2e9c1cfc---22520657845.pdfIn PDF document text
    • http://sushibelovo.ru/files/60650046232.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518fede271---xidaborilujujomob.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/60445286448.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/xumesudezididi.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/80965268240.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/kedupuwegikudekeze.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/77961599780.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613856a59fe13---47605203808.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/53133845371.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zovopabexumanipamababo.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/91151724416.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/nememiwomisuwisiv.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93272aa3e---54214274532.pdfIn PDF document text
    • https://digireg.cn/upload/xarufomugix.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 17796 bytes
SHA-256: 996a3126dd7606b05f5294bbae0ae0dae5f5bf9aeb89fdd74fe4bac3569c606e
font_01_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10532 bytes
SHA-256: 907c040db78e3c603e9d953ec2952ed31290f46220c18857407cd9407593b768

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