Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee023fbb51c6e5f…

MALICIOUS

PDF

90.4 KB Created: 2021-06-23 18:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8d732d6b25b69377c25c008afd7220a SHA-1: 9a6f57aed004fce7d658775f2c3a0898099f8958 SHA-256: 0ee023fbb51c6e5f1cbb4abaf9571695175fd4973dc97374b415d6a0d20b0dc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, including compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmwarts.com/ecovic/file/92161692123.pdf In PDF document text
    • http://rotang.net/userfiles/file/52066507507.pdfIn PDF document text
    • http://beiks.info/public/file/72476603125.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/70381089449.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/41913597.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a11c5822---tigivasesijorer.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/46115584724.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b2782936---mosafavinifulikelib.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8a268097aa070bdfab2426059c394b0a/mexotinupiluzegexo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nifixaj.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6e1870sguu71b68rkec1fj2jod/mavijojiz.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/88088175339.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/fowugemezazuwum.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e53640232---90294815701.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vidukathaigal+with+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010c1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C1D 17396 bytes
SHA-256: 0f5302c73a0b85b70b6349e14f96eed796d8d46c3441dc5b4148897060d45538
font_00_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 5208 bytes
SHA-256: d77831a1fd6a06c0e0695eb0d2b7ed152dde81f99864ad8f8b98ef76ed80c4ff
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 11700 bytes
SHA-256: d0f8f54dc5b38b716ca30d0fef9574011d5d88213024b6098e5cc0ce5af0aab6

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