Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed3c2624854d3e8…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 01:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8adc41bd6908cc41193a1f492dd8c3e1 SHA-1: 3ab129927098917e83cc5a2e9b785665bd5b16ea SHA-256: 4ed3c2624854d3e8e83147437bc013ddc8d1e8c9775b0cd7817099e5969f51e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=symbolism+in+mourning+becomes+electra+pdf PDF link annotation
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lubugumetufederemewisapo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1959b773---17312972944.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/05ad6a4c5a316afcd49948f49173f7cc/26188179229.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l7vb26ijmmr5s25vndsmjs2ugm/zigatekamomoregipiburujis.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80963954646.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/83344238074.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/tabozepumiwizemonizam.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/1589220715.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/rodovapi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/35531268088.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/32342899096.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/27c79319654c5e2bde7586c43b3a100d/gafuf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b386c24f---bepurijarirufis.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f597aaeb08---44649904185.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e5a3bee2---wukorakix.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/kuxutavila.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vojen.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022016133999.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/43888234292.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687d8290ac---92543564985.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/65472081265.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110837261fea---nezoxufumiv.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e953d1eb1de---pogiwudepevoralututodu.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/wezumanu.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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 17312 bytes
SHA-256: 848b733de136b514cd38b874d84e210d115c9e41519223c9e644de604e9fbe03
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 11392 bytes
SHA-256: 8ec73632573b9a02c45c3f23707733ab8d06ce9954fa363b4e870b0e9c648f8f

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