Malicious PDF — malware analysis report

Static analysis result for SHA-256 624f1c7b84fcf8fc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d697f3eb4eed9227dd0a7a2dcd5730b5 SHA-1: 96873c81adcfbf5e2168ac157c682c6dd02b7fa7 SHA-256: 624f1c7b84fcf8fcfa36857435b193ed0f87d83a928a57ed81a458f91111294d
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. Heuristics indicate instructions to disable security software and a lure for a password-protected archive, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agcslohian.com/userfiles/file/zenuxunojuked.pdf In PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/80904767556.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gigipid.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/79462128279.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5aeaa9c---89830437822.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pugitavezovotesanaga.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0525pcd2vm97vc9777ensjc3uh/gafesozijixumewuv.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/28253025144.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/riwuvopoxu.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/4982289711.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/geposolelijugawez.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fodajenujegurowularef.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/wumolururemipalabi.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/wegegasidoz.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/nugop.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k7gdhgeujk1s6pqc56ghgu7480/zajupatinaferimizerefixe.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913032506.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/17149235250.pdfIn PDF document text
    • http://prestopc.it/upload/file/jowatapumixivim.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/kejuzogo.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/36111493439.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/woperunibuwix.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/54200450515.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/suxasatigigovanurusiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=re+loader+win+7PDF 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_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 10156 bytes
SHA-256: 18e54384a3af580263d7ef9c806258260f352a44b3c7c691852f2b988f158025
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17756 bytes
SHA-256: 9b295f4184bbada195d9d99e6c694ff0ed68d757d893ef9a8356911c2ff52430

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