Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb681451fb426abb…

MALICIOUS

PDF

91.8 KB Created: 2021-08-17 07:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b16d758847cb989dec3a974121b145ea SHA-1: e5caa59a96bf4c283d4e915b846b15eca5785790 SHA-256: cb681451fb426abb45a73be46fa087f95b1ac02dc2239bcfe51146ca6c96f19b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it is a link farm and contains social engineering tactics, instructing the user to disable security software and press Win+R or paste a command. This suggests the document is designed to bypass security measures and facilitate the download and execution of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/otipmpovdqmhrfr9lql357gpt1/74214209710.pdf In PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/rowexawanegekadam.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/54976424170.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/wafonube.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd74887c220bbf1a1ad481b545622166/23926172803.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/95138133640.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/xorosadugikawidajuniseki.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fuwisasobi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcdd283b9---wiselibujotoba.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/82987646550.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082759e3a934---giwuso.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a77e47d5fdf91d0bc9173c119173a875/bamesobexasaxafa.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8636aa8e3---ponutovuz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/32c04ef3ef4427762978c8cef0667d92/rimarigixidusubaje.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/42156041092.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/65564012012.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9rq473b6mdc5igs9m52ej08uv7/75006316841.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160947428c9fb0---98135270188.pdfIn PDF document text
    • http://abnicum.com/files/file/bulifapamijon.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/vejafekafasisopisakan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chrome+performance+issues+windows+10PDF 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_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 17620 bytes
SHA-256: b491df6caacd84d70cd657bc0b623e646d7cd3ae32caa89854e23f9230a88e52
font_01_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14697 11132 bytes
SHA-256: 25b192736044bafaa04f527162238a118d4ab93456de99cba3784b75c69646a4

Open this report in the interactive analyzer, or submit your own file for analysis.