Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26783f04b693c03…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 11:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0794f9737c697e931693af75afb27e96 SHA-1: 77e95add838eed592acf4fd1b421ee727c688154 SHA-256: b26783f04b693c03eaa95bf6857ff4bf23ee302b01628258aed2c83ee25194b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this, as they likely host malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b2e128e99a594b9974a3a899eae01379/sijase.pdf In PDF document text
    • https://dienlanhbachkhoa.info/upload/files/3661615071.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705bd9c1c8a---piwekemuwiwekemijapi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c86f6a17c36069b9ea4c1622c5b8c1e5/79476728709.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lezasuzisijupudif.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/38907190923.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kuzevisuneruworenasipef.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eff2cd762---34625484981.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9f13df2cac266840bf2fafabf32cc3cc/50409804710.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021ac4be44---satufijovadivo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/53f8a52070716c6bb1a901963c6fd88b/mexixe.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/vaxejomuwug.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p1uhqqpqqi5rekohtqqorhtjp3/vuweje.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/67319298225.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3e4771278111e18a36e11125f0be082d/wadomemeburebubo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/25472195924.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jodewavamexixesavivil.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c889b4e1---nugilogeganu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991ee61bb8---58440287432.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/getedusinalix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c804325957---92774298445.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8ebf23677fe5066d5296e75e5936144f/zifuparikegurad.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/mujorinuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+father+and+daughter+dance+songsPDF 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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16608 bytes
SHA-256: 5e4e1f72b20a418fbd6dbe761a1bd12d9094ad6c5dee3a0282c7167a6c2204a8
font_01_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 10772 bytes
SHA-256: fea2101d1de6f45c3fdf88acb36dfaf0e3a00cf671e74232de88ccc1eb1eb134

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