Malicious PDF — malware analysis report

Static analysis result for SHA-256 e413b2af0ba509b0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 10:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ecd6921aab99d792a2433ff74795fe0 SHA-1: 9d31065e06092372fa0366f2b527cd82d40010e9 SHA-256: e413b2af0ba509b039f75535da653838451cdbd2881ff41b3a6736ee5bb2f339
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb7e8e46e---xipademewivodadoduxekox.pdf PDF link annotation
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aacc98f504641c1e9c0618bb4a944518/34198072112.pdfIn PDF document text
    • https://nexapos.com/upload/files/luzolokajosulomakemakix.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/8092302850.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e1b3a4e8---71807085439.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613851f55ff71---wegavizatuwimibazesojosa.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/7660157861.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/gapebipifezonor.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c07a13365---77848013459.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/suliw.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8267b6ab---xegofedosoteka.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085894db3da3---44949305013.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/2864566287.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94bc76a3d---6486175253.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d13d199c---71668874733.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/91946908263.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/23771935484.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/46758224313.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/13448132119.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6af8474c9---11012670088.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/39477220700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hymn+for+the+weekend+piano+sheet+music+free+pdfPDF 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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 16688 bytes
SHA-256: 245ef106729a0883a5b7b658473c4db9f6ac62909e4de30c148a54f8eeb3932a
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 11220 bytes
SHA-256: 3b9ffa9bd0bef93fa3259130138e435a213eb79560674172dc04722e278e6748

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