Malicious PDF — malware analysis report

Static analysis result for SHA-256 7027eb4acfa1b9c7…

MALICIOUS

PDF

90.5 KB Created: 2021-10-07 23:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7ea81ab0ddbf6b923acd29a4e568aa4a SHA-1: b7399140594e02d1771be76045899aa4c4cbb1ba SHA-256: 7027eb4acfa1b9c7113e9c91ebae23e092b273305d392bd707ba291e3ca24d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://huerural.com/uploads/image/files/8372700319.pdf In PDF document text
    • https://tecnomatec.cl/upload/file/zuwamimo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e89c8eead6---luwixekexefod.pdfIn PDF document text
    • https://norservis.cz/files/files/72962727625.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xaxuxup.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/95108984081.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/diketakavunoj.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/90401837243.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/51706286594.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea69bd4217---33440250216.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/femobudavaguxagur.pdfIn PDF document text
    • http://benly-carson.com/product/files/53706420605.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nituxatesiritetigeda.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/rowiv.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/vefotase.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/88828424740.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/18887345624.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615564569a888---87293461003.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e397f217a9---jegubizugegorafopas.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/rowozanagelamojin.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/kadesesenelivusuzozo.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/31240251416.pdfIn PDF document text
    • http://apvn.info/userfiles/file/12556473390.pdfIn PDF document text
    • https://adikmanis.com/contents/files/22043594.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a6d9af7dd614570d5f050d0a42f6291a/8299567484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mission+successfully+accomplishedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 22292 bytes
SHA-256: 1c8430e4ce77c1322d57f54fcd5480160c012096e8d55a477e5597f7b258982d
font_01_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 16368 bytes
SHA-256: 80c0d3e83df753ba0651f8085d9bea2c5138e9af9ace33f7ebec0522105d473b
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 10896 bytes
SHA-256: 5af10ec02cec89a4b467639e890e8890598efc587be224e2e6760410e226391c
font_03_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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