Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d28bf94ab4788ee…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 01:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9da3a342b142991f27946df60234d58 SHA-1: 31127a4f645731e7ad4fb9bd7be24cb295a12530 SHA-256: 3d28bf94ab4788ee86d4c824b9c7981a84a86d248ac21eeaa8024e2263627266
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous links pointing to compromised websites and disposable domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pistant.ru/uplcv?utm_term=makalah+dc+shock+pdf PDF link annotation
    • https://cremyco.com/app/webroot/docs/file/sipof.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5fc27157387b02880b39cb5bcb53783d/didumenagewakezi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/g8tu8gt9lhai43g2qtk15n66ad/1650755081.pdfIn PDF document text
    • https://granitnet.hu/editor_up/zaduseluguxolesolagomu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d423397541---8291907108.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/tawonidodur.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85766638307.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/62064755498.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/53edb536f592fa9e8eab0b8a5c71c4f2/bisizimivonisiliruzixuruk.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/59199228216.pdfIn PDF document text
    • https://castel.ro/userfiles/file/legasipililolebanani.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/dawafo.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/6251580940.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/jeximodikuvu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0nhu6oin65t111lkschdp2g7o9/nimifuwifenusoxon.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/90762469645.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r65an15mdbbp0021j4huuqk864/19826949157.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/24450964587.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b6c5dce392fd49d4731110dbed1c409b/69412959945.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8975cc95b79d00b21ec8edcb1b4c1f47/vilunoxilufav.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/24c1c06379e345871bf30dbf7829a827/dutafara.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/sixaxobilowat.pdfIn PDF document text
    • http://pinxedien.net/upload/files/59121912728.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17780 bytes
SHA-256: d00dcf003cf054dd84ff399e361fe56101c4670573927049cb5d69e678aea524
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 10276 bytes
SHA-256: 6194ee308270cd8cf5dc598569a69bc1248f9e4ae78b7511fc9b7edc5a7e733f