Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5720073fe60f4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 00:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de9ac8feb0372b7987ccba7f809085ca SHA-1: 2017aa0d9bd98c90d097f148d5854d5825be06f9 SHA-256: 9dc5720073fe60f4dab77172cd5a1ab17e708c5f5408aa7b33a5eec5f51fece5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to various domains, some of which are hosted on compromised or disposable infrastructure. The presence of 'utm_term=printable+iq+test+pdf' in one URL suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://penal-garazh.ru/files/54218702633.pdf In PDF document text
    • https://sharmtocairo.com/userfiles/files/xudisumalivizaleti.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xinezi.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/1059321930.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kukujixiruniwisi.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34806056517.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433f1fe8616---77812600330.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/30363570287.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-18/images/files/36153477858.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/85082304594.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/95330efd86ac216e70accbf86038a607/baxapusivaxosituzeruraku.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090518114073499.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/19734540114.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jijexinewenesibes.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/14598288386.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u1gkvqelrmuvoj990p0eif599r/19218343833.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/lorokibiwapulowujibi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/75472504745.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/77388507418.pdfIn PDF document text
    • http://canadanur.com/resimler/files/65240499380.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/8030210325.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/39203751027.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/davemosurox.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210914032026.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/60339770404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=printable+iq+test+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_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 19488 bytes
SHA-256: 5a7ddba46e8a52524277e8804edb0fb6df92917280bc9dbe69a4b058c301ac85
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10660 bytes
SHA-256: fd18c13ef6d1aacf31294797b92c5e9fc4dd29f87999d9ea9bed61d41fcf154e
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1