Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3950e599cc9a0de…

MALICIOUS

PDF

82.8 KB Created: 2021-10-07 04:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28ab9a35f1e21bf9ad2b4e606a66b4d9 SHA-1: c6d0430a472264455539e04904ff02fdffdf046b SHA-256: b3950e599cc9a0de578f11f6a0a25714403b07e8a5a40ea775e18ee5dd0b56c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eatorhours.org/e-bussiness/fckimages/file/25215182593.pdf In PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/tobexubiloranoxaratawako.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/zolovoziravow.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109151921489171.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561c9d01058---didevis.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161470e86a413e---pafokuxejumunixej.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/96335601386.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/85756028588.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/rebujudude.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ac8cdb761---pojodunisitifexifowasuzoz.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/78646668176.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/33291627598.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/bubatitafubidadudejos.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/1164073206.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/95164450987.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/jemebagoxiwulu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bokijawikemanaginibo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/2047791913.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/dilid.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/kuwoseduturekexub.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/85918185946.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/72286161115.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/lilinimedusorek.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wowajojoluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+get+outPDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10092 bytes
SHA-256: 859decb8bcc0f0e6170e5a94f4401cef435490089f07b79737a43cc1d8bd0c85
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 18476 bytes
SHA-256: bbb129f02389269f199b3d4af52d3d46ba9c85582763934e94af329d00a5a15c