Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3a27a2abf7b7e6…

MALICIOUS

PDF

72.1 KB Created: 2021-10-01 02:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bc5578a6c32ed47cb972bd463a50e08 SHA-1: 83941c88aa2e9045e89a0eaa855ae7100dde3957 SHA-256: aa3a27a2abf7b7e632199ce0a3f28db68d4a5c1dc4cd5d4fb50c99ac259ec67b
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of 'cmd' tokens in the document text suggests an attempt to execute commands, likely to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://kermanrooz.com/img/files/3704858643.pdf In PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/fupurewedurepowewiti.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/33699987952.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/92252562705.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/13743396027.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/kexobegatikudiwovep.pdfIn PDF document text
    • http://ahchala.com/img/file/wajiguvexo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/rofitewejuvavi.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/71514845622.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c65224bb90515b8c42c5d89f62408a02/kigemanewigusatafaj.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/zilujorejodopa.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/xofisozomosijug.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/sorugur.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/72697584729.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/55400833150.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3f0e6d508c5c9b1f739604352cf9c351/72364602468.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kenosomexovusawetusokon.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/94383130042.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/16v423e4jejuf3mdcmdt4jhdv3/wakaloze.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3898588313.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/zisepugepaji.pdfIn macro / runtime command snippet
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/kapokubuvavutixe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29e384f2b---92952824571.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/luzeluxadewipoj.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/16210800111.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/27301863620.pdfIn PDF document text
    • http://www.awakohchang.com/image/uplIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=funny+gratitude+memePDF 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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 10448 bytes
SHA-256: 76130d096603e4d6b0dd0be13d5c058395f4f5a43e43ff7167722b7d7ffd8afd
font_02_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 17832 bytes
SHA-256: b9603dbf414bf3f73dddb6b8063fde00c994bca6351f69fee44549f694fddc17

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