Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5ce959d0b886a3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 12:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d78d47d31db3423ed49b35b166306f1f SHA-1: e770fdbc95f5deef3332e75651d0ffb6c2478c6f SHA-256: df5ce959d0b886a3f8a74a83fe7ef6582fe54c8bfa34e61b9fe179c8a372b825
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the document is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cambodiadriverservice.com/userfiles/file/xukigodanebopuxuvugajike.pdf In PDF document text
    • https://floresdeserrezuela.com/aym_image/files/feseragoxubedat.pdfIn PDF document text
    • http://levotst.com/uploads/files/gokafenob.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66043810516.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/85558426688.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/62675013902.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6fa3db48e858688882bd96650ed727/lewokakabikejesazoka.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hcv0mj1vm4sbl2p45rtdm4ubmg/gofovaf.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/12916537687.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/wivapexomafiwowizexu.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/19197688714.pdfIn PDF document text
    • http://landpas.pl/upload/file/lezijiwug.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139008d79ba0---22416349297.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b85e40fffa---3701626661.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zisanozig.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/vosebaxokexelapumobadis.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/59942261778.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37972e990eab08a1bc69e039d24a7919/derizapipapepugifixosesix.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/33000102646.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/vimixo.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/57592091707.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/wodovu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cd3b545cb---17324901161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mario+64+rom+zipPDF link annotation
    • https://mediaget.com/userfiles/files/verifofofi.pdfIn PDF document text
    • 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 10164 bytes
SHA-256: 40cd4282b38c224ce528d8ea2a07c9b9ec34d0591409f36f7693e3a2d773d852
font_01_sfnt_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 16668 bytes
SHA-256: 5b63b1fde42d95a040cbabb3e75bab59337818d90fb1849a34e993f507b39015
font_02_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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