Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39018e3d2425c4e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 14:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 624394aabcf589be4a75a9000156b0f4 SHA-1: dc8d495c2196fb2e8d5cf6b475819c37834a806a SHA-256: d39018e3d2425c4e920e5497f7fcd83016aca4b1ad03aab9681f03804797b44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://cqc-material.com/app/webroot/userfiles/files/24011727979.pdf In PDF document text
    • https://floridainvestment.cz/files/file/25454099594.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/775ec326708fea219f843da4a79b0b73/dubaxuwo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986f3a3d7fa---42723396381.pdfIn PDF document text
    • http://effektfilm.de/files/file/nakotekek.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5c85f1d140cc089dbbccbfd842662e6d/lerubisodibu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99070fed7---venezosesakadaxogeku.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pipuzaxokejabobid.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/mimelejusu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/39148426560.pdfIn PDF document text
    • http://usmleworkout.com/files/file/takexesibifejobebe.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/59738518031.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/8491201444.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4763319e---81885899358.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6b17084c9052ddedfcc9807ea03ed49b/41953479394.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/76071507171.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57974393683.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/29530443042.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/nozawagawaliwobumakixo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b898f49b3c---76549581600.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/27589883544.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/xivozanexilugasa.pdfIn PDF document text
    • https://best-label.com/upload/files/nunuxe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0ab7495a---nifuvobema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=learn+small+english+sentences+with+tamil+meaning+pdf+free+downloadPDF 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_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 11112 bytes
SHA-256: 0b85ffa2bbb854ff9dcaf30265c169cfa35c82d5d250626b61d6244571265e4f
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16276 bytes
SHA-256: 120bee4a908a70c18e328934da52c37d2854a03955e981fc320f79ec1df14726
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1