Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a42558cdaeb4cc…

MALICIOUS

PDF

89.8 KB Created: 2021-09-20 06:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9d0da7206b9a97ab2bbc71e53f9035f SHA-1: 542825869d0ac927239666cad690da95904f6777 SHA-256: 66a42558cdaeb4cc3abcefd3c0b6db7c68e2c9e095a8ef3ee66941df0ba7bc6c
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDF files, some hosted on compromised CMS upload storage. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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 https://bagstyle.uz/images/file/89170346048.pdf In PDF document text
    • http://oio.cn/uploadfiles/files/ligasowo.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/18/38798789019.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/forapisof.pdfIn PDF document text
    • http://idroter.org/userfiles/files/13075167296.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/toxosuzufenavovaguvewos.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f61c14229bae6fab468f9137368387cd/norokeroba.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lumivigexetile.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/fopopoxevamarap.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lunibidoxubu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1fd0fec3c5eaf65c7b4b8cfadaab155/basikosibagidu.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/81008701268.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/vozavoxaterop.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/67628785888.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/kajib.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/30114501913.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/55367846421.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/88064636988.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/77808605395.pdfIn PDF document text
    • http://devison-matras.com/upload/file/4653349665.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/naxajelavebilazesil.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/wewafofaziwepetojexizir.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432dbd619ec---gizefisujosobisetoro.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/7623262134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+open+an+apkPDF 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_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10008 bytes
SHA-256: cd459d53c46f5a3b6331191c0174f92a2f741ec7d8e9958a91fe3ad1e833c1cd
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 18564 bytes
SHA-256: 8d72671a6c873433b092e98cf949a5ac46aaa3ce200573b8161dccd4c17c6202

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