Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0672dc18f119117…

MALICIOUS

PDF

96.8 KB Created: 2021-09-03 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7f2db3d075f07404ceb86e509b16198a SHA-1: 287eba5ab9fe31822000488622cdb1d7d7181fb3 SHA-256: e0672dc18f1191173aa6ad8b0607f97a9bf7f9e745859f880d0e8067aa5a84f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ferdavagnar.is/images/fck/file/vawopar.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a40acf3f---38477801647.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/76888885733.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/26864762270.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/db0f76025eccc7915414f62ab408880e/82104897167.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k9f4v0cqq9rhc1empsvbbuuoc1/72025603628.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/63403588471.pdfIn PDF document text
    • https://asken.as/bilder/file/xusilasozabali.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3gvmvsl8kg8fmaopjsdao495n1/wewifemodelobom.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/60780135309.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4nno7gupqtuin6gpqem2mhak83/27844759542.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/38252644785.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/5692314178.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/bonefataxafedivex.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca24df82e---rafiz.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/8162722490.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/67861860188.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/51745151870.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/zesuzaxediza.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fuboke.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zezezamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+insert+pdf+file+as+image+in+wordPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 10920 bytes
SHA-256: c29fecaaf81eef72cc3476b062e9eea0d19803e809a57ea7d78f26a6f738d085
font_01_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 18624 bytes
SHA-256: 95f80a2142f163dfa43803f045c7707448623a929d11a2a7dbbe82412e38b5f5
font_02_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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