Malicious PDF — malware analysis report

Static analysis result for SHA-256 198f19b032f724ed…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 21:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 40777c3690325281772fdcfd26e7f04b SHA-1: 72c3841adc934fdc649ebb9aefca244007f0c553 SHA-256: 198f19b032f724edd238c0dd9cdae8418d521bfb83261eb1629387ef7dc80482
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories and disposable hosting. This indicates a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fizjolech.pl/userfiles/file/3602304063.pdf In PDF document text
    • http://termosystem.pl/userfiles/file/viturolumixowuvajomol.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/vonukujivu.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/24973312612.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6058c158eb59161b00c31dd1a47a39b5/71192554294.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zubikuxif.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/964c2798b696604b7d29854210b19bf0/vemedebikijew.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/15147360524.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/50177915207.pdfIn PDF document text
    • http://mestan.by/images/file/rireparulo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/45878142214.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/95699985842.pdfIn PDF document text
    • http://adveotec.com/img/file/43052250391.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/danuf.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909081659.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/levisinezuravo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780893c751---siluzadamiz.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/salofelerab.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/83011898823.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c00bb4d360089571b8e2062706fbcf51/digadenuvumunawavanose.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/voxepunubep.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/83752194847.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kuperebawutotatul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=throwdown+game+cheatsPDF 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_off0000ae66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE66 10728 bytes
SHA-256: 88e7e4cb36d1ce571822a83c4f073f5dc4e6da29c31373f2c28c4533b79856f6
font_01_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 15208 bytes
SHA-256: 6684b5b62bebb2181b9c4fd991c0210b4aac18f19bd7c0cb659d1af04143dca0
font_02_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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