Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1073293c53e8e3d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 21:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c82f394e3b67272c880eedb27e67734 SHA-1: 8f93e38e9b8b1afb57bdf5b0cb42d8c9ec0b2a3a SHA-256: b1073293c53e8e3d8ab27daa0f6d9c60445c5dafa4a5f9fac4affeac93977d00
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. 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-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://urbanconstructions.org/images/uploadedimages/file/nupabexiluna.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806f203304a---15527801549.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83015600726.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f8fe72e97---67264462652.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d61aae70ea3.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/mopoxisaradepinifuna.pdfIn PDF document text
    • http://e-district.org/userfiles/file/79479721287.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a4083f4b184b9bcbba15c7a002e3f3f4/rologanujeg.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/wololow.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210714024646_744178969.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/95156649016.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6e892677bc6b129f3b13b9f2f5c9b2a/giranokizulito.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fed64f8ac---nopuruba.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/6413093612.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/vufizugowix.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/befebamixirasebakopazo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105c9e0796fd---31834462328.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/nukasedupakevotoze.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091940672f8e---42916820613.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3703e561d3---didezozonafugogusowet.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/meboxatonezunej.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/96550682659.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/78198664009.pdfIn PDF document text
    • http://eternaseguros.net/files/files/fakogetafobibowirirub.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/wawumosa.pdfIn PDF document text
    • http://iknow.pl/files/file/40383394258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fractal+geometry+textbook+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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 11024 bytes
SHA-256: 8e4c50e2cecd9493f3b801f24f8dd924666576f45a6afe43d5a3af311da48ad4
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 17024 bytes
SHA-256: 9a62eca57a10859b74a91416098cc6562ab399a357544c58af1046b79e813443
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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