Malicious PDF — malware analysis report

Static analysis result for SHA-256 0360de985fa1342c…

MALICIOUS

PDF

101.1 KB Created: 2021-08-07 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6f95469cce0d32bc058c7766245f75c SHA-1: 25e7ff7b47f7c6840385093517ffbef88167f506 SHA-256: 0360de985fa1342c7994ccbd3572a6edd19abd724b61a0811e2500becd5329b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

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://allytemp.ru/uplcv?utm_term=parents+as+partners+in+education+9th+edition+pdf+free PDF link annotation
    • http://wawa757.com/uploads/files/safojudalin.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa1039f6caf7c8b7f8263336e5e51f47/zogipuzejagukexer.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162321456821.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9885fd4aad---fexix.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76a64055c7---rokop.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/aiho5qqq7vos832sbrtqo7kilt/jujemametikiwuxo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tosuledepijaromaxejerab.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80660180992.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0f56479a---buvipafuwaxum.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/ragumipawon.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/tepedojukufepapame.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c287503550d---4692202398.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/mixubefepodokukutug.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210601141515.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7cd850f87befce4eb7322729fce22b1e/30248679270.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/moxegaxuvizimal.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/pezarokixi.pdfIn PDF document text
    • https://mbbs.hr/files/11410932101.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/kiwedexudasikokezuso.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fakudusotenoforepalinut.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e66a7ff4cd10592c2b68eadbf94cba4d/pazedinefazukifewomeli.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/jenerota.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_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16848 bytes
SHA-256: 348190361f4d763cab1a60c6ad808baec3b7e886d02d8fbb6de4a2463186051d
font_01_sfnt_off000154fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FE 10940 bytes
SHA-256: 98f787ed3e88dce181fd9d802e3dd86d4366ea7c809c3d342e230cab429458e4
font_02_sfnt_off00016e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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