Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746e59508c74abd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 18:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3812f8e77822d575025643e4968ca655 SHA-1: ecdd0f7e1d18001aa00d57faa5a0ef8dae0bb914 SHA-256: a746e59508c74abd53f3c332243303e0ec9d30b031cee1221b3aba91c95b1fc6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vietsaovang.com/uploads/userfiles/file/14320940878.pdf In PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/50079031097.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/seludivupovubefew.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/sibubejuruzimeseroj.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/38599113465.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/12000085780.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pugixexu.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/12110176392.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a4820b7fb---mokuwozofeximeni.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/pafemuramit.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gadowatagej.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2mittaps2ovf580gjni3nchvg3/tututibunesefajetofov.pdfIn PDF document text
    • https://bataretak.com/img/files/file/93107134608.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/dolimugi.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/40751803047.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1718005139613a85c07566a.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d98d81f---pibidijozuratuwo.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/gudururemofevifu.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bupikuzalukisamanavadana.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161373fa56972d---tofurelapi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210909_E7C14BD2D667E81F.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/nagutivexuzotovafip.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pakunupip.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/67179480818.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gojesupagekasuzevixosodo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f199d2015a---buloserifun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=update+apps+on+my+phonePDF 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10540 bytes
SHA-256: 3b553b010a9919aee1369c8d484ec12ef2f6dcc78491ac9fe233fd03707ebd21
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 18288 bytes
SHA-256: 91d9617001114de9452915a7a75344adc76173e6cea010bc40fdb916e4d1168d

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