Malicious PDF — malware analysis report

Static analysis result for SHA-256 227ca27c43606d2f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 22:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b4fc0c60c0ab772ea330299357ce950 SHA-1: 0aeddb921f7d5461a3e03f0febb19409af2fff05 SHA-256: 227ca27c43606d2f101e68e370b180a16479d559580a0b338fbb15a97011e5c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm with numerous external URLs, some pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=aronium+for+android PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210901192135.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/nubipu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000e09b230---33674563688.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/zujakaselezujodofoxun.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150fe76222---pifova.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/zawugazawokodobokawivalug.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15800489754.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/75296161022.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/59329292040.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69c01f082---89530864898.pdfIn PDF document text
    • http://farashimirooz.com/files/6285334477.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bimapenipawowifavo.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/zujosurufunekoj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3febaf3d4---50094420567.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/turuzalejebuzeb.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/79409967728.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/57735215277.pdfIn PDF document text
    • http://mq-water.net/upload/92528924186.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/21384025356.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/kozogijepe.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_135219_140.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/nixafalazusukuxidavap.pdfIn PDF document text
    • http://djpress.pl/Image/files/rokez.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/59744284529.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lodovugedusi.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/58322980582.pdfIn PDF document text
    • 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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 17636 bytes
SHA-256: f65ba6ae16847e2e542fbcdd551cc6a422bbcd15db6e77cffd5483537c3dcaa6
font_02_sfnt_off000133eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 10152 bytes
SHA-256: 345bbbac5ce322823199de51508c306b0f57e9b11e627bf57854e6d382ffdb88