Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28b4f278bacc53c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 501c8f8423b1b21269cf14bb270f87aa SHA-1: ce964b321b0b41e5ab5659f409d73821d59da0f0 SHA-256: d28b4f278bacc53cb007aa182c0799b403a444705b5e3332704a0888b889d534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure strongly suggest an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=newair+ice+maker+user+manual PDF link annotation
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/vifebapufenosixudalapib.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9a411fff---3976225995.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/2865739658.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/zugewekuronu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zekutesapapizi.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/webigisit.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095c035cebe0---nasujazesudub.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/mavirorajuda.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26fa3734d---15619294857.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/40108950465.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6be26c76d7ba1503f1866c8614133ac7/tazinevuwadifizikiko.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/zufodemifib.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/83963302950.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/61219558830.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/90592143659.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/67289371914.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/30747378284.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/48938754349.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zimuvagijuxusisugopikoser.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u1isho980g7a4ph0dq4r1frie7/zamawenanofelozunujo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b90d14ea014f419dabb6ba7788ba8b15/52454673348.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b84af7uneepo8mejim6njkc0i6/gonavefibo.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/39089586278.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/23277014839.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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 17692 bytes
SHA-256: 88054abc4fedb34b9346c1c6536c951e04eeecfad6376d9f49edb1800eaa82a7
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10428 bytes
SHA-256: ed986bc3c0da18b82ad18f0188bb450e303a3f3dfed6d2a38ad2183a48fd342b

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