Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78c344f6a059cf6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 09:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e3cc79f7adef7d70edb5445f54bfa0e SHA-1: 103564e2bfa24e4530f3ffb85612c831f251bccc SHA-256: d78c344f6a059cf64f90eb4bf27b6858ddf35df6536f9f7a561aef2e2a3e6433
196 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may be intended to trick users into downloading an archive, possibly containing a further payload, by providing a password. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://garglob.ru/uplcv?utm_term=unlock+pdf+linux PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/dofosawuwufamalu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/parapab.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/24403894298.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/90483796343.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/pajulamivaxidolixamamu.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/zakanovusota.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111901475620.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b4df2fbfba9720f577cec6e1e988f4f6/30536397861.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wiloxoputizimafaboziduro.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tukafetopenisigo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/bumenivapano.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/45285812215.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/kafalepirozilux.pdfIn PDF document text
    • http://poiskvod.ru/images/file/luwudepawigu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92045ed6o5mvhno2stiuhr5ob9/kisifugajarida.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/695dc292c575a12dfd09c18848838d9f/11985167526.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gamejutomur.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/kemoravikixakiwemovov.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a3f4eb6ebed79e630152d42969cbc60/zexadilu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/19347507921.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161356266a37a1---lazudomoxakerilu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/92030972104.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/giloka.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nesimobinavu.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_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 21204 bytes
SHA-256: 977c33b05dd8c43f0d4da598a7d462bea5e33ae6fa901997eb7a4ad51795bc5c
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10256 bytes
SHA-256: 00645104399597fb21a33bb85f0bfb245bb49b97863ef7e7f7e32fdcb57288f1
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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