Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a878c0b71a0225a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 08:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8da598c01e18964a70829efc730fc8f9 SHA-1: a4db6d1ddd0cfcf4421e9962d1fed69b481420bd SHA-256: 9a878c0b71a0225a6b7b556f2c8b041022e5ecd0b443cd10e4c6f2b5fbac0dda
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of external URIs and link farms on disposable hosting suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=partituras+de+valses+mexicanos+pdf PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d676f134---libifosevukuxat.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/3370587594.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/18941019424.pdfIn PDF document text
    • https://defaico.com/d/files/26920280663.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/17053959757.pdfIn PDF document text
    • https://senhewood.com/d/files/zusodeb.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/39c74ad8b558d64490ba9e233692cbe1/gizakipafi.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/goxivojawazamikajixefe.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/dodoworatixozovak.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/mosase.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/81353734473.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/golipugazej.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/83p9epckt80ukp5mii4qberpsd/pavolupizinavip.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kaguzaluwogivurumil.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kerojiraxamitagosami.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e27c33507e5889123420655f82e4160d/tuloxelaretuwew.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6007d518581622be6a5e2f3e6635a6f4/90112068105.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ns3ddvkarjbf7tn16gu4qn6chh/zugepogesurusigoduxi.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/faxakaxes.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/1593120065.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7e0b6baf678c37189463b479903c3e29/nuzemujogivi.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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 20100 bytes
SHA-256: 1df27e311167683f2f78e27776fd8820872f873af985a9d393f6e0c447b54bfe
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 11052 bytes
SHA-256: 90c42d4e28cc8aea9a3dc1a66c5bc3d771ff973c4518c002dd18cb0696809660

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