Malicious PDF — malware analysis report

Static analysis result for SHA-256 afadcfbcaaba0d0a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 00:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f8972117d3a48b80ab1b276e411dd7a9 SHA-1: 6a6c139b2964729217cadf8cec69321b82cc8961 SHA-256: afadcfbcaaba0d0a16b63cdb7d50cf7a5fa3b54dc9b83751e42a78c0cccbdcd3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=416b+cat+backhoe+manual PDF link annotation
    • http://transcash.com/ci/userfiles/files/vevuwomulojemoloredosujot.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/76930189764.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/tifijixetorubox.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/jagojudebosozuxaderezut.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106210947426345.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3aac895217d8bda2630a0c8dc4412770/levinosu.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/37108085193.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/nebenuronevolarefitagip.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9bag9qi4iprf4g23dj1usnmk0h/65421189643.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5b5f1ba1278e3a594562c5d271dd50b1/58615579618.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/59c935594e716d5818168f187496faba/37595958838.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219f53b2cb1---74884574169.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/3270358660.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/4701195623.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af61032d7---60961772681.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/65331842706.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pagitanaxuxafupuvuvofosu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/zuwumigovoka.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ivarufasukotipefibam.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/98443860597.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612397c0afb08---vogokanuparikoxokiduwaso.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608300f93bd41---dosemodizilise.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/wunugurop.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43edeb00b---dunitowajuga.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/watizipesuwoxarolevanig.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba8635ae9---zukefutetapexogo.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/jaxamefitesozewugufuged.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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 17712 bytes
SHA-256: 4e988ed67b395c9ed21f0373faf7b7aa9047c7db236dfb8f87fe0d08d68684fa
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10668 bytes
SHA-256: 7c732f5f7d333f88d5de4700aab4ed06357ae7eddd9c6d46f02a1c6208836bfc

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