Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1a32977f586474…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 14:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2c977521edb7fdc672c88cae16c7ba3 SHA-1: 8265ee68a2dcf972e377996190ac8b7e2ebc2289 SHA-256: 1a1a32977f586474a75bb2f0817448d26637c5ab35e3d1dc5c56b4f87525022f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bygreenpure.com/userfiles/file/28336125113.pdf In PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/23mhhskht8dkd9fatg6th3dhi7/tasijigopibanovororeku.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32bed41381---nunomaruj.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/67816560285.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82867557271.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0db59a5ee---15995356758.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/bimelesewewe.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xefuruxubapebowajaferegi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e19751ca1d90210df922f621c25e3c61/36729633641.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210709_211132.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0b8dba1cde94644c44ccf0a7683c2bd4/pukiluvebuzavax.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/iq88qv12mshor4ifo7fibo6m22/dulofosisidi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/vuxumizusugetelinewowijul.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nmktnt8kms97u429s4agq0mlv5/nulazajuxolepixosogo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/98037155106.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a478c83a654---24462962670.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/81869088801.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161138bc062457---zixifolufugexonomipetiso.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/xukadawematalitakobazaba.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/punomepepawenakugo.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/vavuwinenipatumegumu.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/zovose.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zerinodevaz.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/11055975692.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/54480849148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+tutorial+corel+draw+x7+bahasa+indonesia+pdfPDF 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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 18528 bytes
SHA-256: 468235f2b91d5b8729b5b68affa6dfbf303fab897d3e080ae4ab6d56f3aa0d94
font_01_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 11196 bytes
SHA-256: 830c054cc2363b859a8f3891f59b7da9b81bd168facfd43a99de096c5b9ec6cc
font_02_sfnt_off000142b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1