Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf3a431dd1174f2…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 06:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 411614adfe2bd2c4b42cfe3c90a01204 SHA-1: 9a912cc734e7f4a969073c6afe076667d311d88b SHA-256: 3bf3a431dd1174f28a27eb7e91ea543a9a8e3060fee4d3d95abebff3d9bd2737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to potentially compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://rasmesafar.net/basefile/basefiles/86918428337.pdf In PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/zapawirojavesawowal.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rafabugaxajan.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kufiganudetavevat.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420846aee08---pojixujaniwujumumevex.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/71642112275.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7ab7f1c0---papovimususamu.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sujurafipes.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/ragokugixape.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/71233836956.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/maucqjj4jvfgi7ciou2rb1gtu6/roteneke.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/miserujej.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/99055756576.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/70896674553.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424bb7eea81---44884027545.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/kazutaxuxozisepamobu.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909032130.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d540a66d7c04f66bfbbd7835cf29fce/77288279663.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f382f879---55375337854.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54706055516.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/seliwosorilowumojoge.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/gotufod.pdfIn PDF document text
    • http://montesantangelo.it/files/files/10491505910.pdfIn PDF document text
    • http://exosushi.com/uploads/files/9703061381.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/kewixajebatetimumoxafek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+kissing+booth+full+movie+online+eng+subPDF 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_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 19192 bytes
SHA-256: 200fee3e78ea4c0e7d3a2bb12e062deda3b456267dc4e341d3ef92124a76e4b3
font_01_sfnt_off0001381c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15033 10760 bytes
SHA-256: 71813afa0c86322eeaac655b1cdb56162217969cfe38147338efe41e16d6c8df

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