Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e5e3e61d217a33…

MALICIOUS

PDF

100.2 KB Created: 2021-09-02 20:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd039316b53404e7539d5f760b436634 SHA-1: 772d65a8c536224911c2ad5e4a34c829e9c3593a SHA-256: 84e5e3e61d217a331b184ee0d54f77357697196a4a590ec3daf5586570ca064a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2642c3138b---37668612028.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/88e3a2a5421a01478bbab29b1d8c5006/zakavekanuva.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/e3e50e8ab3a1dee065463270e1d9eda3/fozufomozexoridezesoponom.pdfIn PDF document text
    • https://matratva.in/userfiles/file/deralevidezadirem.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/36522797042.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/89df254378bba60a93c3dd7abe99bebb/69868395580.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ae779aac---32075535408.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fa8a343---98904040711.pdfIn PDF document text
    • http://gyobel.itpublic/file/1372533569.pdfIn PDF document text
    • https://kede.org/userfiles/file/85225152693.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ovqakpbebjg5kj52kcvkvthjj8/pelapojoxuseranilu.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/pikusikudesumanilomebo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/68550310501.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/vakirogazonigetilip.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/dejelerobumutofufaboref.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b946782542a---xoninujidaj.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-6/20210806094724201408.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/felaloginiterelirun.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210603012152.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2909b6a3---47449045779.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/46213877404.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161063d4bb400a---64761393971.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/purefavubawasowoka.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/47271557081.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/19923208474.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xugetozifuxepixojizegizod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=total+knee+replacement+exercises+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_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 17360 bytes
SHA-256: 36a7c70f3e1c06fd2f350593bda1bea7b643f6f3eb2e9ddd02e6bb80c3f94a3a
font_01_sfnt_off0001512e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512E 10936 bytes
SHA-256: 36d500153a6c72894db6e3e0d1838cb6e60998b98c97b653bb03f28237c8eeb6
font_02_sfnt_off00016a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.