Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc080f0c2646d47…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6ea9836d6f11ef131389872bd3f01e6e SHA-1: d7d6a6edcf84c6f90b3beeb0c2d9431a447ca00e SHA-256: 0dc080f0c2646d473ad8510cfb156090a24f5ce5b1e9d7a2d0bc4474edd9c6ef
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 http://dinskayarealty.ru/media/file/51116414341.pdf In PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627570048_4af70a589d.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791693b3457---45625876085.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce8d5158e---lelukiruro.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3cf7c4a80084f4fa1facb12131e8fdfc/sanipozugilixizeniwawu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4121ebba38---lijemubafujirad.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/solomewupunobaduma.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160730b7ebef8a---86240331060.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/94199230757.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7561798cfde01dc0695f1c33bc222da1/xukutomotalubo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bfaeef874b397d3eb1b0027cf8502bb7/biwakumenub.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107310310268842605tob8y.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jufowuvemimojomonerodo.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/8259092003.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/pozovaxanopozurilaxakuz.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/59882843077.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vivutuzixinekalupebut.pdfIn PDF document text
    • https://projetovm.com/uploads/files/68238763781.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/48102877366.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/51779022630.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/546b1c2b07aba51e701354100cd4909b/48701328600.pdfIn PDF document text
    • http://leguido.net/files/9700867861.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/17634659854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=new+jobs+for+freshersPDF 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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 17588 bytes
SHA-256: 4ed45774ffd60698b01fa9ff2f529af8552d412e6fa9ddce831e796671b64235
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 10144 bytes
SHA-256: d8498ca25e61a7dfe3a2e329f6c216b2493788d758425b8654b95ec7ff681d0f
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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