Malicious PDF — malware analysis report

Static analysis result for SHA-256 c040c2090af61c11…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37b314b1f2681eeeebaf43bb0ea50797 SHA-1: 1120dadab2f68b0579c81c32e2ca54868d65b63e SHA-256: c040c2090af61c1103ddb674a174512c2861f9b334de9e17ea073349741b865b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains a link farm pointing to various websites, many of which appear to be compromised WordPress installations, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites under the guise of offering a PDF converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ssqkkua56sjk3vtg71b7qnv5v8/nogapuxiruxaleju.pdf In PDF document text
    • http://bamor.org/userfiles/file/kinuxolutupasufi.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/vegixutelotixujaximuvava.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080929923884---26948816900.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vomizafi.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/82785320737.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/67497864042.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/mutisazo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6998caee27128960b36ca77c3450270a/61102202651.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/18920359316.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e75e733217dce21f6e83603ce45e0559/nozojamusojojekapir.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/70504039851.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d49a06f1---88241674929.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15396205801.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ecacba4087d---63141204029.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e820300a69dd640b28e68025a76e7e8/84241933994.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/96615278721.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sosedide.pdfIn PDF document text
    • http://www.celso.org/download/dopokejijuwujewawijopakif.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/540a31f7f944cd00f1797cc9eebea8b8/71114961389.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d1626ab1a94d967ecbc80ab8edfd8ad6/80530641994.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee16f52c922---89189386313.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/vikir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+programa+converter+pdf+em+excel+gratisPDF 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 11216 bytes
SHA-256: c1fcbafc393e08b8aed4c6a086d5a72d6f5e66156207fdd51b0ed535cddc30de
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16084 bytes
SHA-256: 0a4b610015150c58b6561a2914d9892c15c87669b108b41875e2035bd4ed29a3
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1