Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f00088a9dddafb4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c313825a530e11ba98b7a8f0f5a4b41 SHA-1: 3e63a21e3f571e762cacc918b7d16237ed966f94 SHA-256: 6f00088a9dddafb4bffde47754bbb3c4d04a6fc24719425819670f895cbe662b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

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 http://ciarajewellery.com/editor_upload/file/pudidenobenoriduvezikam.pdf In PDF document text
    • http://turnyras.lt/Files/file/9711025243.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/89469708000.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mofixareris.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/mudapaki.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/9832574451.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109022053514454.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/retidujafenafebadipiwen.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5a64d41a6---rurofulukozojibunokara.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ff97c10c11ed964d7616dd4051d296ea/25492864835.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wivopemubizeboduju.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/47465933410.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/xozolasukotetupupirebo.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bewupuve.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/10118637787.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wekegafuropozowezexopakug.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/2717207992.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/65316004616.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/68164798734.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/3085373319.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144256512a90---lejurumususu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/85d0gjjalnadb3mrup2l0b9d9m/kopogegel.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xumexujodefemozu.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/23793481082.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613665afd0165---tiwaralovusuvozukoraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=el+poder+de+los+introvertidos+pdfPDF 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_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 10376 bytes
SHA-256: 7bd07bca3f8d2ba29cc0f616e85ed6def8ccf0e0f984d6afc9ee1f6f53c31413
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 18772 bytes
SHA-256: eee20e665e0152acc52afd865381311b7830430b9cdb39ac63f99b2b7a0cc459