Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcbc6ff4c447848…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 14:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bfe99e024a179f7353f818660dbe5e8 SHA-1: d01b670f860b5f002b83e502e25fb313acf72fa1 SHA-256: dbcbc6ff4c447848b3ca571f8964a58e5b9136718175619c5dfa961dc7c03981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These elements suggest the PDF is designed to redirect users to malicious sites or download further payloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://murielbellhomes.com/userfiles/files/dixikubanurokasozarovo.pdf In PDF document text
    • https://ap-qatar.com/userfiles/files/11911367028.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e4c0f0c2b---92537131940.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/48850609349.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/34915899577.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/39369979380.pdfIn PDF document text
    • https://bdata.vn/upload/files/25620886987.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/pamotawitifakeramujak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nedewetuju.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471a8552832---48587530721.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/74933419797.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/11904716208.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/votedad.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/popamubil.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/gipizidunepapot.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wosidobigofa.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/9380574846.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sesililopiwazebe.pdfIn PDF document text
    • https://dm288.com/slicice/file/34121830257.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s9uo5s8ab1nbi65ob4pijgpvv1/39042329052.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/pilokena.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/15228477798.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/fabir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=final+fantasy+9+apkPDF 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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 17788 bytes
SHA-256: 7ec850656a5f83047e52d1c9a1d1dd1af4d36983eb9a0de017184c1db69623e1
font_02_sfnt_off00012619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 10352 bytes
SHA-256: 171f46b2235afba7fd804eaf7860781032545be1436fcba4c9544612d6d5fbc7

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