Malicious PDF — malware analysis report

Static analysis result for SHA-256 365725282b447452…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c69574406f87236712d212c0d4c63d6 SHA-1: e96f0645f1825a2fce235a44bdc6fea17baf72e4 SHA-256: 365725282b44745280305af7d27a7f570606ce4eb69be2468ca19bf8bb23c014
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to host or redirect to malicious content. The embedded JavaScript is likely responsible for initiating these redirects or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://melz-feu.ru/upload/lonovud.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/26654649747.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3j7fkkisroik21uj1vo1s7ea66/fetimumopaj.pdfIn PDF document text
    • http://technocom.pl/editor/file/7326104098.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e603de1ad88c624dff371c866e31841f/vazodufovus.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/39805e6191fd977582231af449573a7d/23721384515.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/75950551959.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/89fd15bf9ac2462ca9704c2fc393f308/59707069576.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/64143926549.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc04a66d6---48891389086.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/pexugesegofiguzeluseluba.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef8b73f3c0ee3be32ad2ddf9732bdbcc/dabunikagugeta.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffe788ad5---vumafisenobujiro.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c07b6afdd---57675490590.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7idh940ejet1l95717cnk90gkq/22304357184.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/babc72817fb59fcbc555c44e831b4b84/66351209750.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/butixu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16cc16bacca148e59f11fceb08668b10/84820082892.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c75c897e1---mitiso.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/64rqtplrlkeuiald2ei1blaana/2157995593.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/17940482152.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/88480090889.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2b68l47d4ipb2cehkb9qmo4sh9/22295420439.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/604ceb5d6cab0bffb4ed307483470c3d/19762991587.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840332e53f5---zolizoxetuwobixeb.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608374ed3c950---96501883024.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/49798146544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=need+for+environmental+impact+assessmentPDF 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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17232 bytes
SHA-256: 4a8c1133f1970d4a6fe48ca143aa84d8ea3cbc166e9e78b468340b6041729805
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10824 bytes
SHA-256: e486267c13e36602df7c219dd0eb2cc455019034539f911937edcb6ed0150b8c
font_02_sfnt_off000138ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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