Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba86ed1248d1a81…

MALICIOUS

PDF

122.7 KB Created: 2021-09-07 06:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7805bf3c2aed911ffba128fb1e809ccb SHA-1: 8429b48019b92c2e673aff4816ce0bd8541d2902 SHA-256: fba86ed1248d1a815aa8b0abc8af6ca4ead6f52e9a7ac896027f3a3d099ab023
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. The primary attack pattern observed is the use of malicious links within the PDF to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=patofisiologi+kanker+tulang+pdf PDF link annotation
    • https://condicionamentofisico.com/arquivos/file/49474006258.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/449763624.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/33612910795.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///56253158287.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/35587165775.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/90058032446.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/kikutesefinanukematurok.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/58193814784.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/mirugafurojuroxe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af80b195a4---ragowotefabize.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd49d96492---xiwaku.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd419dcda2f---24715994212.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/15160066755.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/36444485597.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729ea2e368---83351710589.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c0171879c30bdf1545871511b227a4/ruverisajudetukudipivo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d45431dc---81862870972.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/49606107112.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210828_0E854DE8DA54F956.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16107bac7052ec---tulikukebe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f17b34a2171b7c71b436eec5be06392e/tozofebixasemumoj.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/forekuw.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/ridox.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136c61abf3d3---pipabapusaviniku.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_off00017ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA7 18664 bytes
SHA-256: af5fa600b8ff4d1284870f854426ecca0e46e1670f426655d42d5240a213b246
font_01_sfnt_off0001ab5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB5A 10868 bytes
SHA-256: b75d23c0640cd6ee92c3fd91b2676ca95c0bc3420411bc3f1af0f741b0dd8a4c
font_02_sfnt_off0001c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1