Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb8facb42c60090…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 02:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d6aa9f2b3fcbe0a1be9965c64388ac2 SHA-1: 479957c85b914f55bb894cc9b35eb1273cc9f7f1 SHA-256: bfb8facb42c60090348890eb4010a98726040ba78956bb4b1e914fe54291c578
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristics identify the document as a link farm on disposable hosting, likely intended to redirect users to malicious content or phishing pages. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa11cb912---fitadapixoron.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vc4cpdnh3qm4crvb729c8eufq2/50331992827.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cec8cea7e9c2122ffe95a62a51292920/74341198107.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/nudowigobufo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/uhua4s9r8t32sutvch5in910q7/11564823757.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610894b07ed4b---tugowileturowikolurimegun.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6d89686d5074feba98114bae0852de04/16053601587.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/86973484391.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/45191706704.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16118563cb2808---90127159976.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdadd29f72---29560377621.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f6039c83---bexogoxopoda.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/72288d1549aeede2ba9d082f9e854ff7/68254714431.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3fff2ae7---5916165714.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49dd814fd---negudazirifufinu.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/motusudigirupipadoku.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a23ec0c---gasomarilofisekusiva.pdfIn PDF document text
    • http://888chji.com/userfiles/files/80029737162.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1f7da53a7---66260926171.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e2ef0471d5c9f5ad7f0e24b6b810acd3/zasejipikenoj.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nebevo.pdfIn PDF document text
    • http://fotossc.pl/_files/file/82253866375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+to+do+if+check+expiresPDF 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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 17004 bytes
SHA-256: 23dda7608c294395be382c0fee7ec606dc68fbfdfb71f3935fa7cdaca7ad07a1
font_01_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 10752 bytes
SHA-256: 3629a9d79381cea5b0b5d6b5f1c3d7f6d2d131f844a726b584939027b2aff1ec
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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