Malicious PDF — malware analysis report

Static analysis result for SHA-256 a647496f7ba307b9…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 01:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae998cb34a338aaa6a5a8c034cb5a65c SHA-1: b855b9e0e0cd51b5503069f59ea515f472aea8f6 SHA-256: a647496f7ba307b974731fc119e7434660e44f920b04855f47113be0bf61fa2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/102b65ae958258593d765b12f0005a66/73392264456.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/81908682507.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/mobadumututad.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3567750a7---36055671813.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/levuwaxoluletisetura.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/nipojevu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609431a5d793a---67157804151.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bbd2e501---9837726541.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210725232300.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/28242152518.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d5e4f7d00a0219f264950cc85f8f584e/movuxalupasudazamonixuvit.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8021b9c6---14882966355.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/56139116617.pdfIn PDF document text
    • https://htchninc.com/d/files/93662480787.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bokifoniketubakir.pdfIn PDF document text
    • http://aimic.com/userfiles/file/46800646223.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eda50f39---45277023041.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/46b27accc0dec1bb1bcc3231916d4a49/venokofovum.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fowuwowidi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f8b95ffe---jidojivokoj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43d3b0511---15110428363.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612413f675509---nirekifubif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=not+answering+the+phone+quotesPDF 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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 18952 bytes
SHA-256: 9f112b97b553638321eb2d3c67123536ba49f5a8c260d614778293a38a8fb2ee
font_02_sfnt_off00016076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16076 10792 bytes
SHA-256: ca19b971b2580ba24d0033c6f5dea3dc7d07b112a8eefb62ecd65b7a7afc6712

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