Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04e3d49e0c635ce…

MALICIOUS

PDF

78.0 KB Created: 2021-08-20 02:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7435559732caba3c7559673a038ed61a SHA-1: 90f162b5dafb51ceadb6d0cbf7b1a0490538d459 SHA-256: f04e3d49e0c635ce1595a64a36b28d19d41502aa7fe73a51f8f953ea8ea798d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0a4cb2c0---82714744042.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f7aa4857---47515721742.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e687558493---lixerasuzuxivufezonodiwo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/70999406027.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061623061163.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b24b46ad0a8603691ce8fc65b9e7e9fc/77101049550.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/neniburikilibapefab.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rht6i74t95vkq6vl6s16cbduf8/54411249932.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/rozasapegofigidowewebele.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dixezotiwigidefuxoda.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/30044325585.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d83a5bf88---semenuvomatubokejo.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210813231100.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c461bbcfee3---53678353126.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/35652810782.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a257940bce---85391868221.pdfIn PDF document text
    • http://unseretochter.ch/images/file/96157047076.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7330a8e14---90873585817.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e08fdcc2dd---wojemodudejezoguborerus.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/ninajizuluzo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b08927c51---74486835163.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/6ad81fe4c758da033958a2491b17d516/vejelubapopomimaki.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffc45c69c31e8261114b00ea456dde71/dodosamenarewubekesejage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gattu+aur+battu+ki+dosti+yaari+cartoon+videoPDF 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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 10868 bytes
SHA-256: aee9647d3d3f9af7b88e41ff811e8fd42d5d375ab7f661739fa068adccf4b59b
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16916 bytes
SHA-256: eb0f7adf7ecbf526fe2689dc9d5c72d702c70870223cee2dac8f406cf4b8c9f4

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