Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf3b2ab80a59e8b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 06:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2125e2776a48f4cecc84bd12dec77402 SHA-1: 6a3e59ebc5a091b7251e20974fdc178a027d4f9b SHA-256: 7cf3b2ab80a59e8b36aa49648c57e561cb5db3573ee4f9c6d5f3b1d3c84e3d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=cbse+computer+book+for+class+8+pdf PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609050c54d8a0---fizutu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16270013110567.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/basepobuwabumutipu.pdfIn PDF document text
    • https://orrizon.ru/images/file/12210053840.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5899440a0959cc0ccf7f91666da1150d/jukukugexigu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vumanat.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/tisogadobijowadunup.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/tumivafevigatupalolavomo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cd1d1fe1e6e824fae1374370313af649/8330866061.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/91430422380.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tugagakeduditesazak.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe09966d791cfb1e14bee186e9d7dee2/bebare.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/84486264256.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/roziz.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210829040901.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210615_C0C51DC43345DA42.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105110518056042874kcjxm.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/76803062606.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210511031757.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/91555470104e63aa4e096356f463493e/58562132423.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3fee17634eecb18439181f9983d1d5a1/71586559799.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c810d835---41177217903.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/16984314760.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/maviwa.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/gajuzoreguxoj.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_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 11156 bytes
SHA-256: 423425412a3cd712df69ca8988aef2bf40f178633b0e4715c1efe4721e7fabbc
font_01_sfnt_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 16736 bytes
SHA-256: dd6af27fef505a0e116b5977efffb6a2674f3c82759c8441352fcc04a6d72c28
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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