Malicious PDF — malware analysis report

Static analysis result for SHA-256 057b97d6fc9854f7…

MALICIOUS

PDF

98.8 KB Created: 2021-09-07 11:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bd287553f94b38261c633525e25df07 SHA-1: bc3d1f3fe6685701ab2993c2d7dba028a48447f5 SHA-256: 057b97d6fc9854f738312b585601fcb5a7a38b0d9a07b15cf3f72acacbc8777b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous URLs, many pointing to compromised or disposable hosting, suggest the document functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/83249183703.pdf In PDF document text
    • http://rc-mst.com/mst/_upload/files/6598401095.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/62547754092.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03252c26c8---xeterosifimiduwezav.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wozirujabiworijexegexuzu.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210704091947.pdfIn PDF document text
    • https://bem-sa.com/img/file/15403814923.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/23bfa7933129bf81ba80d818b5c4e4a5/6296806904.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/15079845628.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/62040027793.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac0248c95---78179402501.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/lexuluvuxomuxowo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/19067881620.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/9189954286.pdfIn PDF document text
    • https://migger.dk/userimages/file/66106800082.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3aa43c34edd19f7a26076d92ccab110/xirerogozewoviseneputax.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/wijetomewadotixetabedaxe.pdfIn PDF document text
    • http://rld-carbon.ru/file/ledamizonufabexajov.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/selodutipabisuxu.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/23755102221.pdfIn PDF document text
    • http://poorclarescork.ie/images/teruro.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/43837518576.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/segogapatewuxujinadumi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf1d2de61---30876487626.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bd1a8d7ce---ziwarolurowesodadabur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=que+es+fertilizacion+in+vitro+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_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 10896 bytes
SHA-256: 2ed6fe59dea3aa4db06027b9a78017936cfc24b26127ac5abf19680c78521ccd
font_01_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 19328 bytes
SHA-256: 201fa01f516c2a7e02c2c03843febab42bb6107d0c7c2ee26f21502bcec1dd3e
font_02_sfnt_off0001658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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