Malicious PDF — malware analysis report

Static analysis result for SHA-256 67457bb074cd45aa…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 20:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d98ecd619ea1d2461f45df28678c29a SHA-1: fbe5cda3fe8921e209778d36f5ef661472645306 SHA-256: 67457bb074cd45aaa0f933b1544d73d0bddb479260a2ae61e12f5a2ec5231bb1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/peneravobebiverew.pdf In PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/17505952586.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vezetu.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdfIn PDF document text
    • http://umhouses.com/uploads/files/34008350343.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac1c0d9d123387ce851b33cfdfc395ca/32973131740.pdfIn PDF document text
    • http://jadeite.ru/images/file/22862256783.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/63932023527.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/watodusuvibosoxikufowip.pdfIn PDF document text
    • http://c-six.it/userfiles/files/zesewivogaxizi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/80100892069.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/66344994251.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/tejadokefonatomotal.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/242613533.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dogizadexem.pdfIn PDF document text
    • http://exosushi.com/uploads/files/povamozusikab.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vuzibisaxanuwusaxod.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dopug.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/72058d5244298e6bec86fc824994157c/78109915969.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tazilukemip.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/2137195711.pdfIn PDF document text
    • https://digireg.cn/upload/sibifixiniwajevose.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b116c7f92---15592575922.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed6cae725---vidunukedasupekofufifa.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/joxijivaku.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050119088179.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/26347229149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=weather+forecast+application+for+androidPDF 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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 19888 bytes
SHA-256: 678204cad9c2950d46aacceccb12381ebd7daad7df7e6f6b0450d6c807492c56
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10708 bytes
SHA-256: 196d36df0fb36f6134e874b69eab966346c52aa84d4a1c8c532c1de77e9d7ce7

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