Malicious PDF — malware analysis report

Static analysis result for SHA-256 4346fcab1cb0e1e5…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 23:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3061cff55b1e9a279fb926b889bf83e7 SHA-1: 1016705548d7921c5aedf9fcc9dcc56927e85b4f SHA-256: 4346fcab1cb0e1e5277d2a55ef79e3f49448d36721533fac95b28c5bad944d71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://labuchedeberce.fr/userfiles/file/14266083100.pdf In PDF document text
    • http://shinies.ru/img/lib/file/lofosubusur.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9ae1f65---93228061126.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e21ac0821---57129014680.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/44781210907.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/vabirubunofutitus.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42831232683.pdfIn PDF document text
    • https://clickbox.ro/images/file/15822470553.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/8820455843.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/14999543545.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/90390003629.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/pagudikezoxudafikotem.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/xufixekulabamelo.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/92697259085.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9d0ac26d5856324fafb92627b96ec72c/5209231728.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf536f35c---9041066139.pdfIn PDF document text
    • http://bptramptour.pl/files/file/zefilozetubukifidevadifij.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/52436859492.pdfIn PDF document text
    • http://lovesenergy.nl/file/9622007593.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140e77f6768e---wefinakopupedubetipe.pdfIn PDF document text
    • http://fruitvita.com/files/files/wajebipero.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/13258338871.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/4825546579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=amazon+fire+tv+stick+vs+mi+box+4kPDF 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 18012 bytes
SHA-256: bbf0c77dd5e3a33db8ad6cdd3657a795613b5cf75719fa694ce419c73c63803c
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10972 bytes
SHA-256: acdcd6f21bb5cf5d25385625914b3e812e5058dd20f357aed0dadbbd9b7e9dec
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1