Malicious PDF — malware analysis report

Static analysis result for SHA-256 59582d0db7abdc77…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 15:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd8d4e93109e4f12f67556aae9c01796 SHA-1: eae59cbfa53cddcf80a54356817c71cf2c678ed5 SHA-256: 59582d0db7abdc77c098cb4fc4c2ddc5750268bc1af7706f8425df6aae8c1545
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://etpatatietpatata.com/userfiles/files/10171302512.pdf In PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/47567791100.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b083d96a---46150604311.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f95b4b059---wikojovuforotuzumowero.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/kifowijimirof.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/21676703410.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729972aa79c---25024341000.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/bivefumo.pdfIn PDF document text
    • http://ezibra.pl/upload//file/tinosesokexezukuloxalo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/db73563162a715af694ed892215e7969/xajatuvabubaxex.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/75078037870.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d2c992abcfce8b7c72463bf43e6b2ed8/70648280469.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/bumuxakugapovupela.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/86114248650.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/kubivuzakejumumibipi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/65712474595.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/75957077153.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c72c28646b---xikulogilado.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/44247460915.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/8q6uvtvas69fuiegsodo3kfef2/31059063327.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/54949796810.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/42750036824.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/69621187497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+teach+classification+of+living+organismsPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 17948 bytes
SHA-256: 54e7ba4bd83a86cba681ebba88e27b8b9ab00670b391f9d9d30fa396de0442c8
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10924 bytes
SHA-256: 06912b91009ccb43564972351d35eb5c8f52387557dc18300c171592d29306b5

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