Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e843f2832242b9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 18:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8df1479604d9236e523d801c57a24d76 SHA-1: d7976a3b473fe83f33ea21038cfc798d8d6138b4 SHA-256: 54e843f2832242b900c8e55d9771f0d5f2680f9dfef4343fe4bbb9aaf2574f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a link farm and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://studioturina.com/userfiles/files/30581813867.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79382a5263282eed626bccdf55d04d0b/93813360844.pdfIn PDF document text
    • https://p87.hu/files/taropebenabepewad.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/56339832290.pdfIn PDF document text
    • http://17njl.com/userfiles/files/gimazekifedozanox.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/47430cc1e58366f98250fa25dcb05be5/20082013951.pdfIn PDF document text
    • http://ailizia.com/userfiles/wupez.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/rakizigugedezob.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501081111296719.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/poporipusebilaludaduwujok.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/45196599839.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/6894577123.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dd6b9e927---jibimoxopuvo.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/945accec8c98838e7983b3aad74c8ea8/modojeba.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mtsqk1cvmk4qj5j0cdvlv2c1v3/36265852873.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zakapubupinudizogotovesir.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaa4ea9a5---49306901339.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/65735136044.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/59877954075.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/3964755137.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/gilipanupugipa.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7874764804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+high+school+diploma+template+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_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 16432 bytes
SHA-256: e84ecb11a0b1f159d0f1af58944dede1d5873ebd2406ca239b2efbd2e155e00e
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10940 bytes
SHA-256: d4ac18fdaa7333443fc4a7c748b8da603388a0348e5766312656424592dee7c5