Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35c1ef592d9980c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 05:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a62b54e4e39db69a35678d615b3b5ecd SHA-1: 121a05b3b0d6f015fdc89ded45c1838599b74478 SHA-256: e35c1ef592d9980c108f065dda0c07f189b6603b5f68416dd12e4f5edb779f02
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters further support the classification as a link farm, likely used for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=panasonic+inverter+microwave+manual+demo+mode PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39dd33a28---seveguvewuvugivud.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tkfc84pd6lm288mosn0jjlfbgb/41650770856.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/36548156471.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/kuxapedamomudoradugo.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kizevebikemomiwafiv.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/14039912490.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/sumoxijezijipug.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/jepamegibupewekowemodot.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a054a0daaf87c06bf7624f4608e92a85/kezijozatalojedimefuvudes.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/82434201397.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/95828585833.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160811066e184d---mazafigaxe.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/difasiwoluv.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lusewexef.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/31222060873.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/23471032307.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/sojalaxuvebu.pdfIn PDF document text
    • https://digiconelectronics.com/media/43543523151.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/notalerirumagipiso.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/10686496301.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/ratewedividutotodefanip.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/6047795673.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_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 18496 bytes
SHA-256: 3486c648ede933976879e38f0b29cb6c41aadeb3e45b24fcdae0ce0f4d6568d1
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10784 bytes
SHA-256: c0490dcaeff7b07aee21bda16b4c927d1b105312708783eb36c1044ecb63dd1f