Malicious PDF — malware analysis report

Static analysis result for SHA-256 1089f8e13f91dda1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 01:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97a67966fbe52b0d5fbd46a558189224 SHA-1: d54ae7a9fe2d7446d00eaab81c05b07523209973 SHA-256: 1089f8e13f91dda17edc85eef2930347183d3dcb4c82bd41852e55164b7f3295
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple unknown URLs suggests a redirection chain designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ddeevk8q3pm55h1i8qqua539l9/tabiretoxipawufudo.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed61e4df05---37598608330.pdfIn PDF document text
    • http://renknh.com/ckupload/files/57757450474.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246d94397f---fisumaru.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/52002543311.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/godigarupavokazemofipudij.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/49692889158.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/midarajirekujilerewevuka.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2284802de10241cecc44e82a8689ad26/89085520178.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/semuliboxegitefimawipajaj.pdfIn PDF document text
    • https://rcot.org/userfiles/file/dedaz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9571adaf---43190592228.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34858b62---37777597838.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/15320444062.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ti7ejh5eirfqbc4edcoq9nud6g/78015120049.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/803f0b062aa74da396569287f8802b9f/guvejexewafokuwif.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac9a1563c---50189133566.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vorasuxol.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/vexolovalafasus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c498a09e2d---94135102993.pdfIn PDF document text
    • http://accronline.com/userfiles/file/likavemunadamola.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/864422de83434f2fd205889df6a07527/sasakekinifemuxulonakidup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sample+motivation+letter+for+university+admission+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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 11012 bytes
SHA-256: 69b3cd6c5348574da5e273b45a282470261e194c9ffb56e109ba67741ecb06b8
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 17052 bytes
SHA-256: 3ba96b8f330af3e006baa0840b11b4330c7201ca85f1954dc107642af2b66490

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