Malicious PDF — malware analysis report

Static analysis result for SHA-256 184c2566579cb61a…

MALICIOUS

PDF

154.2 KB Created: 2021-06-30 09:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c11fcf1f264f217ee64743d3b8ca7b5 SHA-1: 258be11230fc37cba05d77565df9877965d9eba1 SHA-256: 184c2566579cb61a5b0996a7a24e0334d7332df3820bb3ccc4ba9afee054e42c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains. This suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8542

Heuristics 7

  • 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.
  • 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.
  • 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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ib3d3327m5okmouqmcsj4vdr64/35876505249.pdf In PDF document text
    • https://palcev.ru/userfiles/file/vedukosurez.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bb48af81c8be7857589131642855d629/59007220030.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/nejagiseto.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63da6e1417---23585432210.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7c43699769f1d65aa0e51f561e8dc2e0/94010182183.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210606155658069.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/81980397571.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/64016162338.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vagunijirilev.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3df6e6a01---lojutoxeju.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tanixopuwutupol.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a312701e655---xexopogoxasumefemafilek.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/hapjsohmkf71lne6hkmnh316a1/99121503238.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ef393dc90a6f1b8e25210bac17f573a2/88042709673.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/venuletuwuki.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5kd708t76dvpulc849nl048g5g/40909882181.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/tanipavet.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b30a5191---ziwarojorol.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a359cd09ab4---vuwolewed.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/mekaruzaxaluwatopesakasej.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/12741343573.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/duwakewipuranifiwevab.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/43587672272.pdfIn PDF document text
    • http://bronia.org/userfiles/file/zajobufopuralasif.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c279db15091---pupiwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+become+a+mermaid+in+real+life+in+10+secondsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B220 11028 bytes
SHA-256: 7d56ce8d4ff411ebee1f45350a74cdaeaee9b4c80998b4a1e24d27d6d85ada39
font_02_sfnt_off0001cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBCC 17388 bytes
SHA-256: e3731023529a7f4f871d73a747ff719ecfd02b6ae63d815973c81630fd6884af
font_03_sfnt_off0001e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5D8 18644 bytes
SHA-256: 8daf3c48647964f3e9186a3516bf2b34ad11df21745f659e696317ffa5e90e29
font_04_sfnt_off00021d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D57 25340 bytes
SHA-256: 76ace86235310bb646aeab59dc8bee615c8c2955d8393c7ee767bc1e44bcf3a9

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